Given the recent outages on the github website below are a list of sites compiled that would be good to consider as a part of a migration plan
- Gitlab http://gitlab.org/
- Gitorious https://gitorious.org/
- ChiliProject https://www.chiliproject.org/
- Apache Allura http://sourceforge.net/projects/allura/
- Bitbucket https://bitbucket.org/
- Kiln http://www.fogcreek.com/kiln/
- Codeplane https://codeplane.com/
- Sourcegraph https://sourcegraph.com/