TortoiseSVN - The coolest interface to (Sub)version control
FileInvite - Stop chasing your clients for documents! Easily request files, documents, forms & signatures from your clients – set a due date and save hours as your requests are returned to you effortlessly.
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
iDeals Virtual Data Room - iDeals Virtual Data Room is a tool that provides secure access to large amount of confidential documents and can view, analyze and collaborate in a protected environment.
Xversion - Super easy enterprise class version control.
Clinked - White-label Client and Team Workspace