A couple of project I participate in. So far they’re all written in python, and everyone but pupyMPI is based on django.
Pagegangster
An online conversion of PDF files to flash flip books, or whatever you wish to call them. We’re the first to actually automate the process, but that’s the past. We’re having a lot of fun with extending the system and pushing Django.
BitBucket
Online mercurial repository hosting. I haven’t coded much on the project but looking forward to doing so. I have some great ideas for making the issue system a fantastic part of the system. Stay tuned!
pupyMPI
A pure python MPI implementation. It’s rally not fast enough for any real use, but it should be very cool for fast prototyping. Take a look at the bitbucket page.