Discourse is an open-source forum.
Installation
The new forum is available as discourseAUR.
The current version is out of date, and has an issue with redis-namespace.
In order to build the latest version and avoid the redis-namespace issue, download the snapshot.
In the PKGBUILD file, change the version number from 2.6.2 to 3.0.0 *and* rename COPYRIGHT.txt to COPYRIGHT.md.