Letter: A
- aeolus - Aeolus, a synthesized pipe organ
- ambdec - Ambisonics decoder
- ams - Realtime modular synthesizer
- amsynth - Software Synthesizer
- ardour2 - Multichannel Digital Audio Workstation
- audicle - Experimental ChucK programming environment
- avr-binutils - GNU binutils for AVR
- avr-gcc - GNU Compiler Collection for AVR