Free while in open beta, later on it will still be free for non-commercial use.
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Pro Semantic Diff and Merge Tools for most languages
This includes C#, Java, C, C++, VB.Net, and Delphi.
Lays out the repository in a visual way that makes sense and paints a clear picture of what is going on.
Not based on web technologies so it doesn't carry the same weight and performance implications.