If you'd like to hack on Singular, you can follow the instructions provided by github and start by forking the Sources repo on GitHub:
http://github.com/Singular/Sources
See [here](@ref development_model_page) for a brief description of the git-supported development model we use.
For help with this procedure and general questions about development please write to libsingular-devel@googlegroups.com. Feel free to ask for comments or a review of your changes on the mailing list as well.
Before sending a pull request to merge your changes, make sure that
- any new functions are properly documented
- new functions are tested
- consider special cases! Optimally all decision branches of new functions should be covered by tests
- the Singular test suite passes without failure. Instructions on running the test suite is available on this wiki.
@note Almost everything GitHub-related can be done from command-line with the following tool http://hub.github.com.
@note A mirror of the repository is available at git://www.singular.uni-kl.de/Singular.git, with a web interface at http://www.singular.uni-kl.de/git
Another mirror can be found at Google Code: https://code.google.com/p/singular/