BitKeeper

BitKeeper invented Distributed Version Control. We've been refining it ever since. Our mature feature set emphasizes flexibility, scalability, and safety across the enterprise. We believe that the only developers who should spend time thinking about version control, are the ones who are actively developing version control software. For everyone else, it should just work. BitKeeper launched the first viable distributed version control system back in 1998. Even though BitKeeper is designed primarily for commercial projects, our initial claim to fame was providing the first version control system for the Linux kernel. By many accounts, adopting BitKeeper not only increased the pace of development by 10X, it also allowed the project to scale and prevented Linux from following BSD down a path of endless forks.