Forum/ps

Forum may refer to

Forum software:
 * forum extension, an extension that adds forum-like discussion features to the software
 * LiquidThreads, a popular forum extension

Forums on MediaWiki.org:
 * Support desk, the discussion forum here on mediawiki.org to ask questions about the MediaWiki software
 * Current issues, the discussion board about mediawiki.org itself (not the MediaWiki software in general)