In addition to your MODX account:
Coders wishing to contribute to the project will want a GitHub account. Accounts are free if all of your repositories are public, as your forks of any open source MODX repositories will be. You may also wish to host private repositories for a fee. View GitHub plans and sign up.
The MODX Documentation Wiki is maintained by community members. If you wish to contribute to the Documentation, please request access by emailing email@example.com with your MODX.com username and what parts of the documentation you'd like to be able of working on.