svn gui for web browsers

I've looked at viewvc and websvn, but what I really want is something
that I can give two different tags and get a summary of the files that
are different, click on one of the files and get the typical colorized
diff that both websvn and viewvc provide.

TortoiseSVN appears to have this, but I was hoping for a browser-based
solution. Is there anything like this out there?

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