ViewVC is a full-featured browser interface for the CVS and Subversion version control systems (VCS). Even hard-core command-line users will find something to like in this GUI front end.

The thread about GUIs for git tracking (Sourcetree is the best, btw ) reminded me that I still have a hard time with merging when it arises. What are you guys using? I generally use git-svn for work, ...