Source Code Edit
The Trosnoth source code repository can be accessed on bitbucket.
Development Environment Edit
If you don't yet have a favourite Python editor, we recommend using PyCharm community edition. PyCharm gives you easy code navigation and static checking. We've even added some PyCharm project settings to the Trosnoth repo so you can easily spin up a Trosnoth server, play a Trosnoth solo game, or run the test suite.
Most communication about development on Trosnoth takes place on the Trosnoth developers group. If you want to get involved, join the group, then send a message to the group introducing yourself.