2. GuanxiRelational programming in Haskell. Mostly developed on twitch.
3. LinearLow-dimensional linear algebra primitives for Haskell.
4. HaskCategory theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)
5. CodaA language experiment -- irc.freenode.net ##coda
6. LensLenses, Folds, and Traversals - Join us on freenode #haskell-lens
9. DiscriminationFast linear time sorting and discrimination for a large class of data types
10. BoundCombinators for manipulating locally-nameless generalized de Bruijn terms
11. ReflectionReifies arbitrary Haskell terms into types that can be reflected back into terms
12. Succinctplayground for working with succinct data structures
28. AdAutomatic Differentiation
29. TrifectaParser combinators with highlighting, slicing, layout, literate comments, Clang-style diagnostics and the kitchen sink
30. voidProvides Data.Void, which is in base since ghc 7.8 or so
31. unboxedexperimenting with unlifted classes via backpack
32. thcAn experimental "Turbo" Haskell Runtime - Nothing really to see here yet
33. scheme-monadsminimalist polymorphic scheme-(co)monads, written to avoid use of any advanced language features except hygienic macros
36. glComplete raw OpenGL bindings for Haskell
37. bitsBit twiddling and bitwise serialization primitives
42. bada playground for working with fully static tensors and automatic differentiation
43. hyphenationKnuth-Liang Hyphenation for Haskell based on TeX hyphenation files
45. monad-ranRight Kan extension transformers covering the entire MTL, IO, ST s, and STM in Haskell in a generalization of continuation passing style