Apache Cotton, previous named Mysos, is now an Apache incubator project, and we've moved the codebase to ASF.
Please check out the source code from Apache's git repostory:
git clone https://git-wip-us.apache.org/repos/asf/incubator-cotton.git
or if you prefer GitHub, use the GitHub mirror:
git clone https://github.com/apache/incubator-cotton.git
For issue tracking and patches, we use Apache-maintained infrastructure including the JIRA issue tracker instead of the GitHub one, and review board for patches instead of pull requests.
We'll update the new Cotton homepage soon for other information including documentation and a getting started guide, etc.
Thanks!