Extensions that are currently in development can be found on MobilityData's roadmap.
Extension proposals can be found in the following places:
- MobilityData maintains a portal with a list of GTFS extension proposals. The roadmap is based on their members' prioritization. You can contribute ideas or extensions via the portal.
- TransitWiki.org contains a list GTFS extension projects.
For more information, contact firstname.lastname@example.org