help.openstreetmap.org is one of the contact channels of the OpenStreetMap community. You can post OpenStreetMap-related questions and/or help answer them. The idea of it is to find the best-suited answer to a question that is likely of interest to many people. Read the help site FAQ page to get started.
The software is OSQA.
The running software instance is (apparently) available in an OSM git repo (see https://help.openstreetmap.org/questions/42495/why-does-this-site-require-third-party-resources/42505 ).
The OSQA software is unmaintained. If no replacement/migration is found/made this could lead to "by the May 25th  we will very likely be removing the site without a replacement." (SimonPoole) See comment and mailing list link at https://help.openstreetmap.org/questions/56190/changing-screen-name-to-match-osm-username and Talk:Help.openstreetmap.org#Migration_QSQA_-.3E_ASKBOT.
- https://help.openstreetmap.org/tags/osqa/?sort=mostvoted osqa questions
- https://help.openstreetmap.org/tags/meta/?sort=mostvoted meta questions