Some projects I've worked on:

• I wrote hcross, a cross-platform, open source Haskell application for interactively solving crossword puzzles. It's effectively a free Across Lite replacement, though I hope to eventually add constructing features.
• I have contributed to and maintain libpuz, a C library for handling the Across Lite crossword puzzle file format. I have also participated in the community effort to reverse engineer and document that format, located at the same Google Code project page.
• I wrote hpuz, the Haskell bindings for the libpuz library.
• In 2007, I participated in Jane Street Capital's OCaml Summer Project. This was a great experience, and I highly recommend it. My project was pcl, a port of Haskell's popular Parsec library (monadic parser combinators) to OCaml. Unfortunately, this library isn't as carefully tested or as nicely packaged as I'd like. It's fun to play with, but you probably shouldn't use it in production code now.