Plugin Collections
A major plugin marketplace with a large, regularly updated selection of free plugins alongside excellent sales on premium tools.
Plugin Boutique's free effects section — a curated list of genuinely free plugins available through their marketplace. Not just their own plugins but third-party freebies aggregated in one place. Filterable by category, format, and platform.
The advantage over googling for free plugins is that everything here has been verified as actually free and actually working. Plugin Boutique is a major plugin retailer, so they have the relationships to offer exclusive free versions of otherwise paid plugins. New freebies appear regularly.
Requires a Plugin Boutique account to download, but the account is free.
PluginBoutique
https://www.pluginboutique.com/categories/2-Effects?free=true
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Bedroom Producer's Blog
Editorial curation with reviews and context — not just listings but actual recommendations
Dreya's Awesome Links
Broader directory including obscure freeware not found on commercial marketplaces
MeldaProduction MFreeFXBundle
One massive bundle instead of hunting individual plugins — 38 effects in a single install
Ableton Free Packs
Free instrument and effect packs directly from Ableton — high-quality additions to expand your Live setup.
Aegean Music
A small collection of free and demo plugins with a focus on creative audio processing.
Bertom Audio
Free utilities including a denoiser, EQ curve analyzer, and high-end shaper — essential mixing and mastering tools at no cost.
Blue Cat Audio Freeware
Fully functional, limitation-free audio tools from Blue Cat — analyzers, EQs, and utilities you can use professionally without paying a cent.
Freakshow Industries
Subversive and ridiculous audio effects for sound designers and experimental producers. Available for free — pay if you can.
++ Audio
Free effect plugins from Stanford CCRMA pushing the boundaries of music production and sound design with computer music techniques.