Web application for browsing source code repositories

Are there any web applications for browsing source code repositories that use popular version control systems?

I know that many open-source code sites have a web application for browsing code 开发者_如何学Goon that site, but are there any that let you view repositories hosted on any site? Sometimes, a web application is just so much more convenient than the alternatives.

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You can try Fisheye which is not open source, but it supports major VCS-s.

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Or websvn as an open source alternative to FishEye for subversion.