Trac may serve your purposes, but I'm not sure how much control over the actual day-to-day SVN commands it gives you. It does have a very nice interface for viewing SVN revisions however. Have a look here for an example of a Trac page for gosmore, and OpenStreetMap routing program to get an idea of what it is like.
There is also websvn and viewsvn, but I can't seem to find any that actually allow you to upload files to check in or anything like that. They are all aimed at viewing the repository, downloading files, viewing logs and comparing revisions.
In terms of the day-to-day check-in, check-out stuff, you are probably better off using the svn
command or a friendly GUI like TortoiseSVN (if using from Windows) for that sort of thing.