BitKeeper uses history files that are based on the idea of the delta tables and interleaved deltas from SCCS but the BitKeeper history files are made intentionally incompatible by using a different magic number (0x01 0x48 instead of 0x01 0x68) at the beginning.
However, its file format is still used internally by a few other revision control programs, including BitKeeper and TeamWare.
SVK (also written svk) is a decentralized version control system written in Perl, with a hierarchical distributed design comparable to centralized deployment of BitKeeper and GNU arch.