L-Forum is lightweight but fully featured threaded bulletin board system written in PHP and backended in MySQL/PostgreSQL.

Features:-  Multiple forums
-  Full threading
-  Highly optimized tree-drawing algorithm
-  Opening/collapsing threads
-  Opened threads are remembered in HTTP cookies
-  Simple search engine
-  Marking unread messages
-  Listing of last unread messages
-  Showing all message bodies from one thread on one page
-  Converting WWW and e-mail addresses to HTML links
-  PostgreSQL or MySQL backended (other database support in future)
-  Speed-optimized database design
-  Recording posters IP address in database
-  Multiple design themes
-  Multiple languages: Czech, Danish, Dutch, English, French, Finnish, German, Greek, Italian, Polish, Portugese, Russian, Swedish, Spanish and Turkish
-  Full configuration at WWW page
-  File uploads
-  Moderated forums
-  Removal of messages through administration page
-  Banning IP's from posting
-  No JavaScript
-  CSS support