Privoxy is evolved, and derived from, the Internet Junkbuster, with many improvments and enhancements over the original. Junkbuster was originally written by Anonymous Coders and Junkbusters Corporation, and was released as free open-source software under the GNU GPL. Stefan Waldherr made many improvements, and started the SourceForge project Privoxy to rekindle development. There are now several active developers contributing. The last stable release of Junkbuster was v2.0.2, which has now grown whiskers ;-).