This helper is designed to be a collection of new mechanics based on suggestions from the community, as well as a place to put any random ideas that we have. If you have any ideas for new mechanics/entities that you want to see implemented, let us know, and if it sounds cool/doable we'll add it to the collection.
We have our own GitHub repository: CommunalHelper/CommunalHelper.
You can find us in the Celeste Discord, but we've also got our own Communal Helper server, so consider joining for bug reports, feature requests, and also just hanging out. You can contact the following members if needed:

NOTE: The list of all mechanics has been removed from this description. An up-to-date video is being worked on, and aims to become the main "showcase media" for Communal Helper.
To use this helper as part of your map, put the text below into the Dependencies: section of your everest.yaml:
- Name: CommunalHelper
  Version: 1.19.0