Are there any GUI SVN file management software for Windows?

Excluding TortoiseSVN, I was looking for software with a similar interface to Versions, for OSX.

The only requirement is that the SVN software runs independently of Windows Explorer, preferably with its own window (ala Versions).

Answer

RapidSVN is an alternative, but TourtiseSVN is really your best option. RapidSVN is portable however, and runs in its own GUI.