Brubeck is a database of topological information. Mathematicians: check it out. It should be self explanatory. Non-mathematicians: you can get the basic idea by playing around with this or browsing the code on github.
Teloga provides ensemble management tools for the Auburn University Bands and Choirs. Unfortunately, the codebase is private, but we're doing some fun stuff with dynamic models in Django.
This is a back-burner project, but I'm teaching myself Haskell by working through the Project Euler problems when I have free time (ha!). I figure I already know monads, so why not? My progress is available on github.
If I run across a problem that I think is interesting enough to warrant a write-up, I'll include it in my blog.
I'm new to software development - I just got into it to scratch my particular itch. My background is mostly mathematical:
I like solving interesting problems of any kind, and learning new things along the way. If you have an interesting problem, I'd like to hear about it.