Free, Open-Source software for OS X

Vote for your favourite Mac hard- and software. I'm boycotting it as Quicksilver isn't in the software section ;-)

"Monolingual is a program for removing unnecesary language resources from Mac OS X, in order to reclaim several hundred megabytes of disk space."

An open source NetNewsWire-like RSS reader. After five minutes playing with it, it basically _is_ NNW, with a few nice improvements (eg. a date field when making Smart groups). If NNW exported subscriptions in groups, I'd switch!

"An Innovative CSS Tool for Analysis, Debugging, and Fine-tuning"

"Improved authentication (logins no longer fails silently, and using Cocoalicious with multiple accounts should be a little easier)." - I was having Keychain trouble, so this is the big fix for me. Great wee app.

"Sim Daltonism is a color blindness simulator for Mac OS X. It filters in real-time the area around the mouse pointer and displays the result — as seen by a color blind person — in a floating palette."

"SoundOfAnImage converts images into music. Sometimes the "music" even sounds like music, especially if you play images with a lot of structure and/or symmetry to them"

The new version has a sidebar with thumbnails of open tabs, that you can reorder.