Python itself. Check out the developer guide at https://docs.python.org/devguide...

		briancurtin on July 28, 2014 \| parent \| context \| favorite \| on: Ask HN: Lesser-known open source projects that nee... Python itself. Check out the developer guide at https://docs.python.org/devguide/ and the mentorship list at https://mail.python.org/mailman/listinfo/core-mentorship/ to get started.