UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
VisualSVN Server - Get an easy to use Subversion (SVN) server for Windows. It works out-of-the-box and is suitable both for small business and enterprises. Available for free!
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Subversion Edge - What is Subversion Edge? A certified software stack containing the latest versions
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
VisualSVN - VisualSVN - Subversion plugin for Visual Studio