GVST is a collection of free VST effects and instruments developed by Graham Yeadon, a UK-based programmer based in Bath, England. Yeadon started writing plugins to fill gaps in his own home-recording workflow and eventually released them to the wider bedroom-producer community. The tools emphasize simplicity, low CPU overhead, and a consistent utilitarian interface, though a few venture into more experimental territory.

The catalog spans dynamics and gain tools (GComp, GMax, GSatMax, GGain, GFader, GClip), filters (GBand, GHi, GLow), modulation and time-based effects (GChorus, GTriChorus, GDelay, GDuckDly, GRevDly, GLFO, GSpace), and utilities like GMulti, GStereo, GMonoBass, and GRect. Instruments include the GSinth mono synths and the GLoop triggered sample recorder.

GVST is best known for GSnap, one of the earliest widely-circulated free autotune/pitch-correction plugins, which gave hobbyist producers access to vocal tuning and the exaggerated "robot voice" effect without commercial software. Other frequently referenced tools include GTune (a chromatic tuner), GForm (formant and pitch shifting), and GGrain (granular resynthesis). Plugins are distributed for Windows and macOS at no cost, with optional donations supporting continued development.

GVST has 6 products cataloged on Equipboard, including Filter Plugins, Vocal Processing Plugins, and Tuners. Their gear is featured by 5 artists, with the strongest followings in Electronic, Pop, and Rock. Notable users include Afrojack, Glenn Fricker, and Arston.