You will always find a more complete list at github, but here are some interesting projects I contributed to:
- antxetamedia: website for a local basque radio station.
- snorkels-hs: implementation of a strategic board game written in haskell.
- An introduction to GPG: small introduction to GPG, in Spanish.
- Django: the python web framework with too many features.
- TPB: smooth API for The Pirate Bay.
- lightweight-motion: lightweight RPi-ready motion detection for USB and HTTP(S) cameras.
- django-require: a Django staticfiles post-processor for optimizing with RequireJS.