diff --git a/ChangeLog.md b/ChangeLog.md
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+++ b/ChangeLog.md
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+# Changelog for hs-opentelemetry-exporter-in-memory
+
+## Unreleased changes
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Ian Duncan (c) 2021
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Ian Duncan nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,1 @@
+# hs-opentelemetry-exporter-in-memory
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
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+import Distribution.Simple
+main = defaultMain
diff --git a/hs-opentelemetry-exporter-in-memory.cabal b/hs-opentelemetry-exporter-in-memory.cabal
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--- /dev/null
+++ b/hs-opentelemetry-exporter-in-memory.cabal
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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.4.
+--
+-- see: https://github.com/sol/hpack
+
+name:           hs-opentelemetry-exporter-in-memory
+version:        0.0.1.0
+description:    Please see the README on GitHub at <https://github.com/iand675/hs-opentelemetry/tree/main/exporters/in-memory#readme>
+homepage:       https://github.com/iand675/hs-opentelemetry#readme
+bug-reports:    https://github.com/iand675/hs-opentelemetry/issues
+author:         Ian Duncan
+maintainer:     ian@iankduncan.com
+copyright:      2021 Ian Duncan
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://github.com/iand675/hs-opentelemetry
+
+library
+  exposed-modules:
+      OpenTelemetry.Exporter.InMemory
+  other-modules:
+      Paths_hs_opentelemetry_exporter_in_memory
+  hs-source-dirs:
+      src
+  ghc-options: -Wall
+  build-depends:
+      async
+    , base >=4.7 && <5
+    , hs-opentelemetry-api
+    , unagi-chan
+  default-language: Haskell2010
+
+test-suite hs-opentelemetry-exporter-in-memory-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_hs_opentelemetry_exporter_in_memory
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      async
+    , base >=4.7 && <5
+    , hs-opentelemetry-api
+    , hs-opentelemetry-exporter-in-memory
+    , unagi-chan
+  default-language: Haskell2010
diff --git a/src/OpenTelemetry/Exporter/InMemory.hs b/src/OpenTelemetry/Exporter/InMemory.hs
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+++ b/src/OpenTelemetry/Exporter/InMemory.hs
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+module OpenTelemetry.Exporter.InMemory 
+  ( inMemoryChannelExporter
+  , inMemoryListExporter
+  , module Control.Concurrent.Chan.Unagi
+  ) where
+
+import Control.Concurrent.Async
+import Control.Concurrent.Chan.Unagi
+import Control.Monad.IO.Class
+import Data.IORef
+import OpenTelemetry.Trace.Core
+import OpenTelemetry.Processor
+
+-- | Access exported spans via a concurrently accessible channel that produces spans. 
+-- The spans are exported in the order that the spans end.
+inMemoryChannelExporter :: MonadIO m => m (Processor, OutChan ImmutableSpan)
+inMemoryChannelExporter = liftIO $ do
+  (inChan, outChan) <- newChan
+  let processor = Processor 
+        { processorOnStart = \_ _ -> pure () 
+        , processorOnEnd = \ref -> do
+          writeChan inChan =<< readIORef ref
+        , processorShutdown = do
+          async $ pure ShutdownSuccess
+        , processorForceFlush = pure ()
+        }
+  pure (processor, outChan)
+
+-- | Access exported spans via a mutable reference to a list of spans. The spans
+-- are not guaranteed to be exported in a particular order.
+inMemoryListExporter :: MonadIO m => m (Processor, IORef [ImmutableSpan])
+inMemoryListExporter = liftIO $ do
+  listRef <- newIORef []
+  let processor = Processor 
+        { processorOnStart = \_ _ -> pure () 
+        , processorOnEnd = \ref -> do
+          s <- readIORef ref
+          atomicModifyIORef listRef (\l -> (s : l, ()))
+        , processorShutdown = do
+          async $ pure ShutdownSuccess
+        , processorForceFlush = pure ()
+        }
+  pure (processor, listRef)
diff --git a/test/Spec.hs b/test/Spec.hs
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+++ b/test/Spec.hs
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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"