Open and Free Software
General Desktop Software
General Usage Applications
Smultron
Text editor. Best editor ever on Mac :).
Adium
Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
Anxiety
super-lightweight To-do list application for Mac OS X Leopard that synchronizes with iCal and Mail.
Burn
Burn your files to a disc so you can access them later on. Choose different filesystems so you can share your files with people with different operating systems.
Colloquy
Colloquy is an advanced IRC, SILC & ICB client.
Fugu
Cocoa GUI wrapper for OpenSSH SFTP.
iChm
iChm is an ebook reader for CHM (Microsoft Compiled HTML Help) files.
Teamspeex
TeamSpeak for Mac OS X.
UnrarX
UnRarX is a Mac OS X Cocoa application that allows you to expand rar archives and restore corrupted or missing archives using par2.
SketchBox
SketchBox is a new – multifunctional yet uncluttered – Sticky Notes Manager for your Mac Desktop.
Image/Graphics Manipulation
PaintBrush
Paintbrush is a simple paint program for Mac OS X, reminiscent of Microsoft Paint and Apple’s own now-defunct MacPaint.
Pixen
Pixen is an innovative graphics editor for the Mac. It's designed from top to bottom for pixel artists
Development Software
Software, Code and Project Management Tools
GitX
GitX is a git GUI made for Mac OS X. It currently features a history viewer much like gitk and a commit GUI like git gui.