Stone Voices is a noncommercial audio software project from Siberia, Russia, run by developer Vasily Makarov since 2003. The project releases free VST, VST3, and Audio Unit plugins aimed at musicians, producers, and sound designers working in DAWs like Ableton Live, FL Studio, Reaper, and Studio One.

The catalog is weighted toward reverbs, granular synthesis, and experimental sound design tools. Notable releases include PolyGAS, a polyphonic granular synthesizer with extensive envelope control and microtuning support via VAZ/Anamark files; DReverb, an algorithmic reverb based on a modified Dattorro algorithm; Ambient Reverb, a lower-CPU reverb tuned for ambient work; Retro Radio, which simulates AM radio artifacts like crackle and Morse code bleed-through; and Marazmator, a virtual synthesizer geared toward unusual sound forms. Other plugins include Brandulator (modulated comb filters), Chorus GAS (chorus/flanger/phaser), Moss Equalizer (a 265-band FFT EQ), Granulator, and a Vocal Pitch Shifter.

Stone Voices distributes its software directly from its own site and through freeware plugin aggregators such as KVR Audio and Plugins4Free, with donations accepted via Patreon. The project's output tends to favor niche, experimental signal-processing tools over polished commercial releases, which has given it a following among sound designers looking for unconventional textures.

Stone Voices has 3 products cataloged on Equipboard, including Synth Plugins and Reverb Plugins.