OSM Community Index
The OSM Community Index is a collection of community resources for OSM.
It is used by the iD Editor to display some community suggestions after you have completed an edit.
The index is hosted on github at https://github.com/osmlab/osm-community-index so anyone with a github account can suggest changes and additions. Local Chapters and communities are encouraged to get their local details up-to-date. Do this in a pull request. Index entries are translated into many languages in iD's Transifex project.
Adding new entries
Adding new entries is welcomed, see official documentation and SomeoneElse's diary entry "Adding a resource to the OpenStreetMap Community Index".