- Mozzi (https://sensorium.github.io/Mozzi/)
- arduino-volume1 (https://github.com/connornishijima/arduino-volume1)
- arduino-volume2 (https://github.com/connornishijima/arduino-volume2)
- arduino-volume3 (https://github.com/connornishijima/arduino-volume3)
- Advanced Arduino Sound Synthesis
- 10 or 12 bit DAC from the ATTiny85
- Waveform Generation using an ATTiny85
- Tiny Synth
- Related, but not about sound generation: Tiny Function Generator