GumTree is a neat tool to visualize differences between source code files. Compared to the classic diff tools (such as Meld, KDiff3, etc...), GumTree has two particularties:
Diggit (formerly harmony) is the next generation tool to reverse-engineer the information contained in the software version control systems. It is an extensible framework allowing you to gather the information you need to perform advanced studies against the history of software projects.
An approach to automatically constructing a debugging interface for the Linux kernel.
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