Bazaar

Cvs2Svn   (Compare Project)

Mostly written in Python

License: apache_ish

Mercurial   (Compare Project)

Mostly written in Perl

License: gpl

Bazaar Subversion Plugin   (Compare Project)

License: gpl3_or_later

Apache Subversion   (Compare Project)

Mostly written in C

License: apache_2

Git   (Compare Project)

Mostly written in C

License: gpl

CVS: Concurrent Versions System   (Compare Project)

Mostly written in C

License: gpl

AnkhSVN   (Compare Project)

Mostly written in C#

License: apache_2

monotone   (Compare Project)

Mostly written in C++

License: GPL2

CVSNT   (Compare Project)

License: gpl, lgpl21, lgpl

Stacked Git   (Compare Project)

Mostly written in Rust

License: Unknown