diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/src/UnliftIO/Streams.hs b/src/UnliftIO/Streams.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams.hs
@@ -0,0 +1,66 @@
+module UnliftIO.Streams
+  ( -- * Stream types
+    InputStream
+  , OutputStream
+
+    -- * Creating streams
+  , makeInputStream
+  , makeOutputStream
+
+    -- * Primitive stream operations
+  , read
+  , unRead
+  , peek
+  , write
+  , writeTo
+  , atEOF
+
+    -- * Batteries included
+  , module UnliftIO.Streams.ByteString
+  , module UnliftIO.Streams.Combinators
+  , module UnliftIO.Streams.File
+  , module UnliftIO.Streams.List
+  , module UnliftIO.Streams.Text
+  ) where
+
+import           Control.Monad.IO.Unlift (MonadUnliftIO, liftIO, withRunInIO)
+import           Prelude hiding (read)
+import           System.IO.Streams (InputStream, OutputStream)
+import qualified System.IO.Streams as S
+import           UnliftIO.Streams.Combinators
+import           UnliftIO.Streams.ByteString
+import           UnliftIO.Streams.File
+import           UnliftIO.Streams.List
+import           UnliftIO.Streams.Text
+
+{-# INLINE makeInputStream #-}
+makeInputStream :: MonadUnliftIO m => m (Maybe a) -> m (InputStream a)
+makeInputStream f = withRunInIO $ \io -> S.makeInputStream (io $ f)
+
+{-# INLINE makeOutputStream #-}
+makeOutputStream :: MonadUnliftIO m => (Maybe a -> m ()) -> m (OutputStream a)
+makeOutputStream f = withRunInIO $ \io -> S.makeOutputStream (io . f)
+
+{-# INLINE peek #-}
+peek :: MonadUnliftIO m => InputStream a -> m (Maybe a)
+peek as = liftIO $ S.peek as
+
+{-# INLINE read #-}
+read :: MonadUnliftIO m => InputStream a -> m (Maybe a)
+read as = liftIO $ S.read as
+
+{-# INLINE unRead #-}
+unRead :: MonadUnliftIO m => a -> InputStream a -> m ()
+unRead a as = liftIO $ S.unRead a as
+
+{-# INLINE write #-}
+write :: MonadUnliftIO m => Maybe a -> OutputStream a -> m ()
+write a as = liftIO $ S.write a as
+
+{-# INLINE writeTo #-}
+writeTo :: MonadUnliftIO m => OutputStream a -> Maybe a -> m ()
+writeTo as a = liftIO $ S.writeTo as a
+
+{-# INLINE atEOF #-}
+atEOF :: MonadUnliftIO m => InputStream a -> m Bool
+atEOF as = liftIO $ S.atEOF as
diff --git a/src/UnliftIO/Streams/ByteString.hs b/src/UnliftIO/Streams/ByteString.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams/ByteString.hs
@@ -0,0 +1,13 @@
+module UnliftIO.Streams.ByteString
+  ( lines
+  ) where
+
+import           Control.Monad.IO.Unlift (MonadUnliftIO, liftIO)
+import           Data.ByteString (ByteString)
+import           Prelude hiding (lines)
+import           System.IO.Streams (InputStream)
+import qualified System.IO.Streams.ByteString as SB
+
+{-# INLINE lines #-}
+lines :: (MonadUnliftIO m) => InputStream ByteString -> m (InputStream ByteString)
+lines = liftIO . SB.lines
diff --git a/src/UnliftIO/Streams/Combinators.hs b/src/UnliftIO/Streams/Combinators.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams/Combinators.hs
@@ -0,0 +1,48 @@
+module UnliftIO.Streams.Combinators
+  ( filter
+  , fold
+  , foldM
+  , map
+  , mapM
+  , unfoldM
+  , zip
+  ) where
+
+import           Control.Monad.IO.Unlift (MonadUnliftIO, withRunInIO, liftIO)
+import           Prelude hiding (filter, map, mapM, zip)
+import           System.IO.Streams (InputStream)
+import qualified System.IO.Streams.Combinators as SC
+
+{-# INLINE filter #-}
+filter :: (MonadUnliftIO m) => (a -> Bool) -> InputStream a -> m (InputStream a)
+filter f is = liftIO $ SC.filter f is
+
+{-# INLINE fold #-}
+fold :: (MonadUnliftIO m) => (s -> a -> s) -> s -> InputStream a -> m s
+fold f s0 is = liftIO $ SC.fold f s0 is
+
+{-# INLINE foldM #-}
+foldM :: MonadUnliftIO m => (s -> a -> m s) -> s -> InputStream a -> m s
+foldM f s0 is =
+  withRunInIO $ \io ->
+    SC.foldM (\s a -> io $ f s a) s0 is
+
+{-# INLINE map #-}
+map :: MonadUnliftIO m => (a -> b) -> InputStream a -> m (InputStream b)
+map f is = liftIO $ SC.map f is
+
+{-# INLINE mapM #-}
+mapM :: MonadUnliftIO m => (a -> m b) -> InputStream a -> m (InputStream b)
+mapM f is =
+  withRunInIO $ \io ->
+    SC.mapM (io . f) is
+
+{-# INLINE unfoldM #-}
+unfoldM :: MonadUnliftIO m => (b -> m (Maybe (a, b))) -> b -> m (InputStream a)
+unfoldM f s =
+  withRunInIO $ \io ->
+    SC.unfoldM (io . f) s
+
+{-# INLINE zip #-}
+zip :: MonadUnliftIO m => InputStream a -> InputStream b -> m (InputStream (a, b))
+zip as bs = liftIO $ SC.zip as bs
diff --git a/src/UnliftIO/Streams/File.hs b/src/UnliftIO/Streams/File.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams/File.hs
@@ -0,0 +1,29 @@
+module UnliftIO.Streams.File
+  ( withFileAsInput
+  , withFileAsOutput
+  , withFileAsOutputExt
+  ) where
+
+import           Control.Monad.IO.Unlift (MonadUnliftIO, withRunInIO)
+import           Data.ByteString (ByteString)
+import           System.IO (BufferMode, FilePath, IOMode)
+import           System.IO.Streams (InputStream, OutputStream)
+import qualified System.IO.Streams.File as SF
+
+{-# INLINE withFileAsInput #-}
+withFileAsInput :: (MonadUnliftIO m) => FilePath -> (InputStream ByteString -> m a) -> m a
+withFileAsInput fp m =
+  withRunInIO $ \io ->
+    SF.withFileAsInput fp (io . m)
+
+{-# INLINE withFileAsOutput #-}
+withFileAsOutput :: (MonadUnliftIO m) => FilePath -> (OutputStream ByteString -> m a) -> m a
+withFileAsOutput fp m =
+  withRunInIO $ \io ->
+    SF.withFileAsOutput fp (io . m)
+
+{-# INLINE withFileAsOutputExt #-}
+withFileAsOutputExt :: (MonadUnliftIO m) => FilePath -> IOMode -> BufferMode -> (OutputStream ByteString -> m a) -> m a
+withFileAsOutputExt fp ioMode bufMode m =
+  withRunInIO $ \io ->
+    SF.withFileAsOutputExt fp ioMode bufMode (io . m)
diff --git a/src/UnliftIO/Streams/Internal.hs b/src/UnliftIO/Streams/Internal.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams/Internal.hs
@@ -0,0 +1,5 @@
+module UnliftIO.Streams.Internal
+  ( InputStream(..)
+  ) where
+
+import           System.IO.Streams.Internal (InputStream(..))
diff --git a/src/UnliftIO/Streams/List.hs b/src/UnliftIO/Streams/List.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams/List.hs
@@ -0,0 +1,27 @@
+module UnliftIO.Streams.List
+  ( chunkList
+  , chunkListWith
+  , fromList
+  , toList
+  ) where
+
+import           Control.Monad.IO.Unlift (MonadUnliftIO, liftIO)
+import           Prelude hiding (map)
+import           System.IO.Streams (InputStream)
+import qualified System.IO.Streams.List as SL
+
+{-# INLINE chunkList #-}
+chunkList :: (MonadUnliftIO m) => Int -> InputStream a -> m (InputStream [a])
+chunkList n is = liftIO $ SL.chunkList n is
+
+{-# INLINE chunkListWith #-}
+chunkListWith :: (MonadUnliftIO m) => (a -> Int -> Bool) -> InputStream a -> m (InputStream [a])
+chunkListWith p is = liftIO $ SL.chunkListWith p is
+
+{-# INLINE toList #-}
+toList :: (MonadUnliftIO m) => InputStream a -> m [a]
+toList = liftIO . SL.toList
+
+{-# INLINE fromList #-}
+fromList :: (MonadUnliftIO m) => [a] -> m (InputStream a)
+fromList = liftIO . SL.fromList
diff --git a/src/UnliftIO/Streams/Text.hs b/src/UnliftIO/Streams/Text.hs
new file mode 100644
--- /dev/null
+++ b/src/UnliftIO/Streams/Text.hs
@@ -0,0 +1,24 @@
+module UnliftIO.Streams.Text
+  ( decodeUtf8
+  , decodeUtf8With
+  , encodeUtf8
+  ) where
+
+import           Control.Monad.IO.Unlift (MonadUnliftIO, liftIO)
+import           Data.ByteString (ByteString)
+import           Data.Text (Text)
+import           Data.Text.Encoding.Error (OnDecodeError)
+import           System.IO.Streams (InputStream, OutputStream)
+import qualified System.IO.Streams.Text as ST
+
+{-# INLINE decodeUtf8 #-}
+decodeUtf8 :: (MonadUnliftIO m) => InputStream ByteString -> m (InputStream Text)
+decodeUtf8 = liftIO . ST.decodeUtf8
+
+{-# INLINE decodeUtf8With #-}
+decodeUtf8With :: (MonadUnliftIO m) => OnDecodeError -> InputStream ByteString -> m (InputStream Text)
+decodeUtf8With onDecodeError = liftIO . ST.decodeUtf8With onDecodeError
+
+{-# INLINE encodeUtf8 #-}
+encodeUtf8 :: (MonadUnliftIO m) => OutputStream ByteString -> m (OutputStream Text)
+encodeUtf8 = liftIO . ST.encodeUtf8
diff --git a/unliftio-streams.cabal b/unliftio-streams.cabal
new file mode 100644
--- /dev/null
+++ b/unliftio-streams.cabal
@@ -0,0 +1,32 @@
+Name:                unliftio-streams
+Version:             0.1.0.0
+Synopsis:            Generalization of io-streams to MonadUnliftIO
+Description:         Generalization of io-streams to MonadUnliftIO.
+License:             Apache-2.0
+License-file:        LICENSE
+Category:            Data, Network, IO-Streams
+Cabal-version:       1.24
+Build-type:          Simple
+Author:              Bardur Arantsson
+Maintainer:          Bardur Arantsson <bardur@scientician.net>
+
+Source-Repository head
+  Type:     git
+  Location: https://github.com/BardurArantsson/unliftio-streams
+
+Library
+  Default-Language:    Haskell2010
+  Ghc-Options:         -Wall
+  Hs-Source-Dirs:      src
+  Exposed-Modules:     UnliftIO.Streams
+                       UnliftIO.Streams.ByteString
+                       UnliftIO.Streams.Combinators
+                       UnliftIO.Streams.File
+                       UnliftIO.Streams.Internal
+                       UnliftIO.Streams.List
+                       UnliftIO.Streams.Text
+  Build-Depends:       base >= 4.10 && < 5
+                     , bytestring >= 0.10 && < 1
+                     , io-streams >= 1.5.0.1 && < 2
+                     , text >= 1.2 && < 2
+                     , unliftio-core >= 0.1.2.0 && < 0.2