Earlier quoted context omitted.
Rather than recommending a specific Git hoster such as Github, you should have listed out alternatives... especially as Google Code also supports Subversion and Mercurial.
Subversion & Mercurial? Then actually just RhodeCode ( https://rhodecode.com ) is the only alternative since it supports Git, Mercurial and Subversion. Disclaimer: I am RhodeCode's co-founder.
Kallithea is being actively developed (a 0.2 release is coming soon) by a free software community under the auspices of the software freedom conservancy. See this blog post from Bradley Kuhn for more details: http://ebb.org/bkuhn/blog/2014/07/15/why-kallithea.html