I don't know what does Kiln offer, but there are various tools in various categories:
Code review tool
Equivalent of Rietveld for Subversion, or Mondrian for Perforce.
- Gerrit, used e.g. in Android development
Git hosting solutions
Like SourceForge, or Google Code, or GitHub.
- GitHub:FI aka Github Firewall Install, standalone version of GitHub, proprietary (and expensive)
- Gitorious, in Ruby
- InDefero, in PHP, meant to be equivalent of Google Code
Git repository management
Includes for example user management, permissions.
- Gitosis, in Python, requires setuptools
see Hosting Git repositories, The Easy (and Secure) Way
- Gitolite, in Perl
see http://wiki.github.com/sitaramc/gitolite/
See also Interfaces, frontends, and tools page on git wiki
