If you are an Android/Java Developer, you can develop a plugin to support your favorite transportation network. Just tell me and have a look at the necessary interface.

If you are a public transport association, you can provide a REST API for routing and live departure times. This can be used by Öffi (and other projects). Please tell me and I'll provide you with a proposal.

I've received some questions of how to donate money. It's perfectly ok to use Öffi for free.