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Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.
Bazaar is a simple decentralized revision control system. Decentralized revision control systems give users the ability to branch remote repositories to a local context. Users can commit to local branches without requiring special permission from the branches that they branched from.
JavaHg is a Java library for interacting with Mercurial. It gives you a high-level representation of the repository and lets you commit new files, inspect history, etc.