miniBB is a flat, linear, highly customizable BB. It features MySQL, PostgreSQL, and MSSQL support, table name definitions, color skins, language packs, HTML templates, access control, smilies, search, basic BB codes, member titles and ranks, moderators, email notification, statistics, encrypted cookie logging, IP and user ID tracking and bans, spam protection, "sticky" topics, a powerful admin panel, and more.
UseBB is a PHP/MySQL forum package. Unlike other popular forum systems, it does not strive to have as many features as possible, but to be one of the easiest and most usable forum packages, limiting the basic feature set to only the essential. It is an ideal solution for small to medium-sized Web sites which require an easy to use forum package without the bloat, that produces standards compliant output, and is secure and easily configurable.
Blursoft MetaForum utilizes AJAX to generate a unique forum experience. Threads and posts auto-update in real time, with no refreshing required. User-based moderation ensures only the most interesting topics emerge above your viewing threshold, and private threads invite multiple users to engage in a private conversation. Complete with advanced quoting mechanisms, CSS based templates, and statistically normalized user rankings, MetaForum is a fresh, fast, efficient, and completely new perspective on forums and message boards.