The project is hosted on GitHub.
The following are archives of the mailing lists that used to be hosted on RubyForge (which has since shut down):
Gecode/R is licensed under the GNU LGPL. Gecode is licensed under the MIT license.
Gecode/R uses git for revision control. The repository is hosted at github.
The issue tracker can be used for bugs and feature requests. Please fork and use pull requests for patches.