diff --git a/ChangeLog.md b/ChangeLog.md
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+++ b/ChangeLog.md
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+# Changelog for ixset-typed-conversions
+
+## (v0.1.0.0)
+
+Add conversion functions from `IxSet` to `HashMap` and `Zipper []`.
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright Author name here (c) 2020
+
+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 Author name here 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
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+# ixset-typed-conversions
+
+Conversions from ixset-typed to other containers.
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/ixset-typed-conversions.cabal b/ixset-typed-conversions.cabal
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--- /dev/null
+++ b/ixset-typed-conversions.cabal
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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.2.
+--
+-- see: https://github.com/sol/hpack
+
+name:           ixset-typed-conversions
+version:        0.1.0.0
+synopsis:       Conversions from ixset-typed to other containers.
+description:    Conversions from ixset-typed to other containers; HashMaps, zippers.
+category:       Data Structures
+author:         Daniel Firth
+maintainer:     dan.firth@homotopic.tech
+copyright:      2020 Daniel Firth
+license:        MIT
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://gitlab.com/homotopic-tech/ixset-typed-conversions
+
+library
+  exposed-modules:
+      Data.IxSet.Typed.Conversions
+  other-modules:
+      Paths_ixset_typed_conversions
+  hs-source-dirs:
+      src
+  ghc-options: -Wall -Wcompat -Wincomplete-record-updates -Wincomplete-uni-patterns -Wredundant-constraints
+  build-depends:
+      base >=4.7 && <5
+    , exceptions
+    , hashable
+    , ixset-typed
+    , unordered-containers
+    , zipper-extra
+  default-language: Haskell2010
diff --git a/src/Data/IxSet/Typed/Conversions.hs b/src/Data/IxSet/Typed/Conversions.hs
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--- /dev/null
+++ b/src/Data/IxSet/Typed/Conversions.hs
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+{-# LANGUAGE ScopedTypeVariables #-}
+{- |
+   Module     : Data.IxSet.Typed.Conversions
+   Copyright  : Copyright (C) 2020 Daniel Firth
+   Maintainer : Daniel Firth <dan.firth@homotopic.tech
+   License    : MIT
+   Stability  : experimental
+
+Conversions from ixset-typed to other containers.
+-}
+module Data.IxSet.Typed.Conversions (
+  toHashMap
+, toHashMapBy
+, toHashMapByM
+, toZipperAsc
+, toZipperDesc
+) where
+
+import           Control.Comonad.Zipper.Extra
+import           Control.Monad
+import           Control.Monad.Catch
+import           Data.Hashable
+import qualified Data.HashMap.Strict          as HM
+import           Data.IxSet.Typed             as Ix
+import           Data.Proxy
+
+-- | Convert an `IxSet to a `HashMap`.
+toHashMap :: (Hashable a, IsIndexOf a xs) => IxSet xs k -> HM.HashMap a [k]
+toHashMap = HM.fromList . Ix.groupDescBy
+
+-- | Convert an `IxSet` to a `HashMap` via a function on the index and associated list.
+toHashMapBy :: (Hashable a, IsIndexOf a xs) => IxSet xs k -> (a -> [k] -> k') -> HM.HashMap a k'
+toHashMapBy xs f = HM.fromList $ flip map (Ix.groupDescBy xs) $ \(a, ks) -> (a, f a ks)
+
+-- | Monadic variant of `toHashMapBy`.
+toHashMapByM :: (Monad m, Hashable a, IsIndexOf a xs) => IxSet xs k -> (a -> [k] -> m k') -> m (HM.HashMap a k')
+toHashMapByM xs f = fmap HM.fromList $ forM (Ix.groupDescBy xs) $ \(a, ks) -> do
+                       z <- f a ks
+                       return (a, z)
+
+-- | Convert an `IxSet` to a `Zipper` by descending sort on an index.
+toZipperAsc :: forall proxy ix ixs a m. (IsIndexOf ix ixs, MonadThrow m) => proxy ix -> IxSet ixs a -> m (Zipper [] a)
+toZipperAsc _ = zipper' . Ix.toAscList (Proxy :: Proxy ix)
+
+-- | Convert an `IxSet` to a `Zipper` by descending sort on an index.
+toZipperDesc :: forall proxy ix ixs a m. (IsIndexOf ix ixs, MonadThrow m) => proxy ix -> IxSet ixs a -> m (Zipper [] a)
+toZipperDesc _ = zipper' . Ix.toDescList (Proxy :: Proxy ix)