Here are a few open-source projects I started or contributed to:
An image server for storing and saving screenshots created with the Gyazo screenshooter. It also features a web interface for uploading and mirroring images.
A dashboard for visualising and browsing your chef-provisioned servers, with the ability to generate graphs of the server layout (showing service interactions and dependencies, etc) and provide virtualisation information.
gelber sack ICS calendars
ICS Calendars (importable into Google Calendar, iCal, etc), automatically updated, showing when your next "Gelber Sack" collection is. Useful for forgetful Stuttgarters.
Source code available on github.
A dashboard for Solr replication. Shows the user the current index version across cores and Solr masters/slaves, the progress of replication, and so on. Allows the user to turn on/off replication, polling, execute queries, make backups. Useful with Solr 3.x; mostly outmoded by the new web interface in Solr 4.x.
facebewk is a clever little Python wrapper for the facebook Graph API. It is designed to minimise the number of HTTP requests, while providing a developer-friendly, dynamic representation of data pulled from the API.
Porick is yet another IRC quotes web application, designed as a more modern, AJAXy replacement for Chirpy!
An automatically updating graph of air pollution in 4 major Chinese cities, as tweeted by United States Embassy and Consulate twitter accounts.
Big Picture Cataloguer
The Big Picture Cataloguer downloaders Boston.com's fantastic Big Picture series, tagging each image with its relevant caption. The latest Windows binary is available here.
An annoying twitter bot which corrects other users' misspellings.
A script that searches tineye for higher-res copies of album art.