...Its clean design and implementation make JForum easy to customize and extend.
There is extensive documentation of all aspects of the software at https://sourceforge.net/p/jforum2/wiki2/Home/
Source code and a beta build are available for running JForum on JakartaEE 10 environments such as Tomcat 10.1; it requires Java 11. This has not been tested as extensively, but does not have any known bugs.
JForum is a complete, powerful and multi-threaded forum software. Features include unlimited forums and categories, topic watching, email notification, Private Messages, user ranking, advanced permission schema and moderation options and much more.