Thank you for your interest in contributing to Gittip! 😃
We welcome contributions of all types: design, code, discussion, marketing, etc.
If you are opening a new issue or submitting a pull request, go for it! Don't be afraid that it's a dumb idea or a duplicate of another issue or an unwanted change or whatever, especially if this is your first time participating with us. We're glad to have you! :-)
If you feel like we're ignoring your issue or pull request then call me out (@whit537) on Twitter, or if you're not on Twitter then email or even call me (Chad Whitacre, +1-412-925-4220).
Twitter and IRC are the two main online hangouts for Team Gittip (besides GitHub). I'm @whit537 on Twitter, and we're in #gittip on Freenode for our chatroom (here's a web interface). Jump in and introduce yourself! :-)
We also exist in the real world at times. :-)
For typo fixes and other small changes, you can use the GitHub web interface to propose changes.
To contribute more substantial changes, the first step is to install Gittip locally, which is documented in the README. That file also documents our testing setup. Changes with tests are better than changes without.
Find us on Twitter or Freenode if you get stuck (see above).
Anyone with four commits accepted into the repo through pull requests is invited to be a collaborator. This is opt-in, so we'll ask you first before adding you. Once you're a collaborator, you can commit to the main repo directly without having to submit pull requests. Ideally, collaborators represent people who think of themselves as part of the Gittip development team. If you don't contribute code for a while (a year?) we'll probably retire your collaborator status. There's no shame or hard feelings if you turn down our invitation, or even if you change your mind later, one way or another.
Gittip is licensed under CC0, i.e., it's public domain.