Source code
ModeShape uses the Git distributed version control system for source control. The official ModeShape Git repository is on GitHub.com at
http://github.com/ModeShape/modeshape
See the documentation at that site for instructions on getting the source, forking the repository, and submitting changes via pull-requests.
Statistics
ModeShape is also on Ohloh, which analyzes the source code to determine various statistics. Some of the latest metrics are shown in the right column of this page.