# Community

### Mailing Lists

There are a number of mailing lists that can be good resources when you have questions about public transit data, software, formats like GTFS and GTFS-realtime, and other issues:

- [transitfeed](https://groups.google.com/group/transitfeed): discussion of the open-source [transitfeed](https://groups.google.com/group/transitfeed) project, as well of discussion of the GTFS specification and associated tools.
- [gtfs-realtime](https://groups.google.com/group/gtfs-realtime): discussion of the [GTFS-realtime specification](https://github.com/google/transit/tree/master/gtfs-realtime).
- [gtfs-changes](https://groups.google.com/group/gtfs-changes): discussion of proposal for extending the GTFS specification, as outlined in the [GTFS Changes document](https://github.com/google/transit/blob/master/gtfs/CHANGES.md).
- [transit-developers](https://groups.google.com/group/transit-developers): general transit developer discussions. Many transit agencies also have their own developer mailing lists specific to the agency. For example:
  - [NYC MTA](https://groups.google.com/group/mtadeveloperresources)
  - [Portland, OR](https://groups.google.com/group/transit-developers-pdx)
  - [BART - San Francisco, CA](https://groups.google.com/group/bart-developers)
  - [MassDOT](https://groups.google.com/group/massdotdevelopers)

Check with your local transit agency to see if they have a mailing list of their own.

## Other Resources

- [Google Transit Partners Help Center](https://support.google.com/transitpartners/)
- [Latest GTFS specification on GitHub (English only)](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md)
- If you provide a transportation service that is open to the public, and operates with fixed schedules and routes, we welcome your participation; it is [simple and available at no charge](https://support.google.com/transitpartners/answer/1111471).
- [TransitWiki.org "General Transit Feed Specification" page](http://www.transitwiki.org/TransitWiki/index.php?title=General_Transit_Feed_Specification)
- Several websites serve as a registry of feeds:
  - [Transit.land](https://transit.land/feed-registry/)
  - Public GTFS feed list - [TransitWiki.org "Publicly-accessible public transportation data" page](http://www.transitwiki.org/TransitWiki/index.php?title=Publicly-accessible_public_transportation_data).