JUCE is an open-source cross-platform C application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, LV2 and AAX audio plug-ins.

C Audio Plug-in Framework for desktop, mobile and web

Source code for SonoBus, a real-time network audio streaming collaboration tool.

Audiobook Manager for Audible Users

Convert Audible aax files to mp3 and m4a/m4b

Convert Audible's .aax filetype to MP3, FLAC, M4A, or OPUS

Enhanced version of Cockos' iPlug - A simple-to-use C framework for developing cross platform audio plugins and targeting multiple plugin APIs with the same code. VST / VST3 / Audiounit / RTAS / AAX (Native) formats supported. NOTE: THIS IS OBSOLETE, PLEASE SEE IPLUG2:

A user interface toolkit mainly for audio plug-ins

DSP servers using general purpose computers and networks

Various resources related to developing plugins for audio production.

Make VST2 / VST3 / AU / AAX / CLAP / LV2 / FLP plug-ins for Linux/macOS/Windows, using D.

A command line interface for audible package. With the cli you can download your Audible books, cover, chapter files.

Vaporizer2 hybrid wavetable additive / subtractive VST / AU / AAX synthesizer / sampler workstation plugin

Converts aax to audiofiles online. Please don't sue me amazon.

equalizer plugin

The Open Source Audible Converter

Fast Audible AAX to M4A converter

Decrypt Audible aax and aaxc files.

Audio plugin that lets you use MIDI to pitch-shift via delay to turn unpitched audio into melodies

Audible audio book converter which actually works!