Wikipedia
UBB.threads (formerly WWWThreads) is an Internet forum software package originally written by Rick Baker. Written with PHP using a MySQL database backend, it is comparable to other forum software written in PHP.
WWWThreads was originally written in Perl starting in 1997, then a PHP version was made in 2000. WWWThreads was notable for being one of the first forum software packages to support both flat and threaded discussion. In 2001, WWWThreads was acquired by Infopop Corporation (later known as Groupee, Inc. and now known as Social Strata), owners of the Ultimate Bulletin Board software. It was consequently renamed UBB.threads. After WWWThreads' acquisition by Infopop, the Perl version of WWWThreads was discontinued. The last Perl version of WWWThreads was version 5.4.3. All subsequent versions of UBB.threads starting with version 5.5 were released in PHP only. UBB.threads 6.0 was released in the spring of 2002. The current version is 7.5.9.
On January 1, 2010, UBB.threads was spun off from Social Strata, and sold to Mindraven, Inc. However, in June 2011, UBB.threads was sold to UBB Systems.