The phpBB forum software.
Finally, it's released! Today begins a new chapter in phpBB's history. After five years, over 200,000 lines of new and altered code, and many a long night, the phpBB Group is proud to announce the release of phpBB3, codenamed Olympus.
Yesterday marked phpBB's seventh birthday, and the team finally announced the release date for the long-awaited phpBB3: 14th December 2007. Honestly it feels a little late for me, as I've already moved from phpBB2 to SMF 1.1 in the meantime.