The software section contains Teragon Audio's plugins and other audio-related software. The plugins are cross-platform AU/VST instruments and effects, and all of them are free and open-source.
The developer portal has a wealth of information for audio programmers. This includes guides for getting started with plugin development, as well as articles on various aspects audio programming, and some utilities and scripts to help you along the way.
The performers portal has articles and tutorials about music software and hardware to help you play your music better.