“Mastodon is free, open-source software licensed under AGPLv3. You can open issues for bugs you’ve found or features you think are missing. You can also submit pull requests to this repository or submit translations using Crowdin. To get started, take a look at CONTRIBUTING.md. If your contributions are accepted into Mastodon, you can request to be paid through our OpenCollective.”
Source : mastodon/mastodon: Your self-hosted, globally interconnected microblogging community