TidyTabs - TidyTabs brings tabbed browsing to all of your desktop applications.
TortoiseSVN - The coolest interface to (Sub)version control
QTTabBar - QTTabBar is an extension for Windows Explorer that brings tabbed browsing to Microsoft's file...
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
BrightExplorer - Add a tabbed interface to Windows Explorer.
Xversion - Super easy enterprise class version control.