You can develop any of following app types using Bit:
Cloud/Micro service friendly API
Hybrid mobile apps using ionic
You can develop all these types of apps with Offline|Mobile first support. You also have access to RAD components such as Data-Grid, MultiSelect etc.
There are many ways to contribute
Read docs on https://docs.bit-framework.com/
You can also watch Announcements to track important docs/codes changes.