Is there an equivalent for Windows? http://www.websvn.info/features/
you can look at VisualSVN we have been using it for over 2 years now and its just fantastic. The server is absolutely free. You can use normal tortoise SVN client [free again] with the server without any problems at all.
If you intend to use their Visual Studio.Net add-in, then you might have to shell out 50$ per user license. this is absolutely optional, we have taken up the licenses and i must say that its really handy to have your SVN operations from within .Net IDE.
Try Trac. Its written in python, which means its cross platform, and is possibly the most well integrated wiki/issue tracking system to SVN going. If you use VisualSVN Server (and you should), its very easy to install.
Trac has a very nice web browser, amongst its other features (all of which can be turned off if desired)
Otherwise, assuming you're running subversion through Apache, you can install any of the web-based viewers. Some are more difficult to get going (eg Insurrection, which relies a lot on mod_rewrite, which was too tricky in the end for me to install on Windows) but most are simple.