Agora is a Pinax app for forums. It is focused on core forum functionality and hence is expected to be combined with other Pinax apps for broader features.
See Pinax Forums for a full Django project incorporating numerous apps with the goal of providing an out of the box forums solution.
Agora was originally built by Eldarion, incorporating code and ideas from various client projects. The clients were kind enough to allow Eldarion to open source the app and contribute it to Pinax.