HomeBoy AAC

HomeBoy was a group of programers that created the first ISO compliant publicly available AAC encoder for Windows back in 1998. Also, they were reportedly creators of the first third party plugin for Winamp (their AAC input plugin), and the first ISO-compliant AAC decoder publicly available.
The encoder is just a compile of the original ISO reference sources, therefore quality is bad. But, interestingly, streams created by it can still be played in modern decoders.