Project Hosting on Google Code will close on January 25th, 2016 http://google-opensource.blogspot.com/2015/03/farewell-to-google-code.html
The goal is to backup all related Songbird repositories and host them on GitHub.
Since the beginning of Songbird, most of 3rd party and community add-ons were hosted on Google Code, as the platform was advised by POTI. There are many repositories out here.
Run a full backup of repository Git/SVN to Git for code, and saves issues/wiki.
Google Code also provide a button to export to GitHub.
Here is a list of repositories related to Songbird/Nightingale here: https://framacalc.org/sbgooglecode