SmartGit, the Rainbow Unicorn of Windows Git Clients...
SmartGit 2.1 focuses on a new kind of SVN integration and contains more than 50 other improvements. For a complete list of all changes, please refer to the Change Log.
The new SVN integration supports almost the complete feature set of Subversion. Contrary to git-svn:
SmartGit 2.1 can also be used with existing git-svn repositories, however in this case only offers a limited feature set.
For more details, have a look at the SmartGit as SVN client pages.