TortoiseSVN - The coolest interface to (Sub)version control
SmallDevTools - Handy developer tools with a delightful interface
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Xversion - Super easy enterprise class version control.
TextLab - TextLab is the fastest way to format, prettify, transform, hash, encode, and decode your data instantly!