As a way of an updated answer (I think this question was asked in 2011), I just started using Git extensions for a project that uses Subversion as a repo, but I wanted to use Git locally. Studying my way into it, Git Extensions has GUI-based actions for commands such as SVN Fetch, SVN Rebase, and SVN Dcommit.
So, if (and I donβt know, because I did not use it in 2011) Git Extensions did not support Subversion repositories in 2011, it looks like they have such support now.
Here is an example (see red highlights below):

So, to better answer your question, yes, it has support as an SVN / Git client.
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