bzr 0.8.2-1ubuntu1 (i386 binary) in ubuntu dapper

 Open source distributed version control system that is powerful, friendly,
 and scalable.
 .
 It manages trees of files and subdirectories. In particular, it records
 revisions of trees, representing their state at a particular point in time,
 and information about those revisions and their relationships. Recording and
 retrieving tree revisions is useful in several ways if you are writing
 software or documents or doing similar creative work.