bzr

easy to use distributed version control system
Bazaar is a distributed version control system designed to be easy to
use and intuitive, able to adapt to many workflows, reliable, and
easily extendable.
.
Publishing of branches can be done over plain HTTP, that is, no special
software is needed on the server to host Bazaar branches. Branches can
be pushed to the server via sftp (which most SSH instalations come
with), FTP, or over a custom and faster protocol if bzr is installed in
the remote end.
.
Merging in Bazaar is easy, as the implementation is able to avoid many
spurious conflicts, deals well with repeated merges between branches,
and is able to handle modifications to renamed files correctly.
.
Bazaar is written in Python, and has a flexible plugin interface which
can be used to extend its functionality. Many plugins exist, providing
useful commands (bzrtools), graphical interfaces (bzr-gtk), or native
interaction with Subversion branches (bzr-svn).
.
Install python-paramiko if you are going to push branches to remote
hosts with sftp, and python-pycurl if you'd like for SSL certificates
always to be verified.