I'm the maintainer of CodeWorld.  In addition to the K-12 education uses, CodeWorld provides a web-based programming environment at http://code.world/haskell to write short snippets of Haskell and share it easily with others.  I am trying to ensure that as many interesting Haskell libraries as possible are available on the platform.

If you are interested in ensuring that a library is included, whether you're the maintainer or just am interested user, please take a look at the package list at https://github.com/google/codeworld/blob/master/codeworld-available-pkgs/codeworld-available-pkgs.cabal

Packages that fit here are:

1. No I/O, except for stdin/out/err.  Since CodeWorld runs code in a web browser, there is no filesystem, for example.

2. Do not rely on native libraries, or have dependencies that do.  This all depends on the library building with GHCJS.

3. Do not require use of Template Haskell by clients.  It's okay if your package needs template Haskell to build, but people using your library via CodeWorld cannot yet use TH themselves.

If you have a library you'd like to see included that's not in that list, please let me know, either with just an email or with a pull request at the GitHub link above.

Thanks,

Chris