Now updated to version 4.60! PBLang is a multilingual, SQL-independent, versatile forum software based on PHP. It offers most features which you find in commercial forum software. Email-notification of replies, configurable membership-levels, avatars, private messages, closed mode (only logged-in users can view the board), limitable attachments, configurable UI to match your website, access-restricted forums and many more. It's fast and secure, and can handle large numbers of members and messages. With version 4.60, speed and reliability have been greatly improved. Many new features were added. 20 languages are supported.
The package 4.60 is available from sourceforge.net