Teamprise has announced they are now offering free licenses to CodePlex users.  Teamprise is a multi-platform client you can use for source control that runs on Windows, Linux, or the Macintosh and supports integration with Eclipse.

You can read more at Jim Newkirk's blog: http://blogs.msdn.com/jamesnewkirk/archive/2007/03/20/teamprise-and-codeplex.aspx

You can find the Teamprise announcement here: http://www.woodwardweb.com/teamprise/000339.html