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FabFilter

FabFilter is an audio plugin developer known for a consistent line of mixing and mastering tools including Pro-Q 4 (equalizer), Pro-C 3 (compressor), Pro-L 2 (limiter), and Pro-R 2 (reverb), alongside creative plugins like Saturn 2 (saturation) and Timeless 3 (delay). The company markets itself around "Quality Audio Plug-Ins for Mixing, Mastering and Recording." Each plugin pairs a resizable, highly visual interface with detailed metering and processing modes, such as Pro-Q 4's dynamic and spectral EQ or Pro-L 2's multiple true-peak limiting algorithms. Plugins are sold individually or in bundles such as the Total Bundle, and support VST, VST3, AU, CLAP, AAX, and AudioSuite formats on Windows and Mac.

Soundtoys 5

Soundtoys 5 bundles the full lineup of award‑winning audio effects, from the gritty Decapitator saturation to the lush SuperPlate reverb. Designed for professional DAWs, it delivers high‑quality sound and intuitive controls for mixing, sound design, and creative processing. The suite includes an Effect Rack for chaining plugins, EchoBoy for versatile delays, Little AlterBoy for pitch and formant shaping, and many more. It runs efficiently on both Windows and macOS, supporting VST, AU, and AAX formats.

Auphonic

Auphonic is an automated audio post-production service that applies professional mastering to podcasts, videos, and audiobooks without requiring audio engineering expertise. It combines noise and reverb reduction, an intelligent leveler that balances speakers against music, filtering and auto-EQ with de-esser and de-plosive processing, and loudness normalization to meet broadcast LUFS and true-peak specs. Beyond mastering, Auphonic can automatically remove silence, filler words, and coughs across multiple languages, produce multitrack mixdowns with ducking and noise gating, and generate speech-to-text transcripts, chapters, and show notes. It offers automated publishing to platforms like YouTube, Libsyn, and SoundCloud, plus an API, CLI tools, and Zapier integration, making it popular with podcasters, video creators, and broadcasters including BBC Radio, iHeartRadio, and MSNBC.

LANDR Mastering

LANDR Mastering uses artificial intelligence to analyze and enhance your tracks, delivering polished, radio‑ready audio in minutes. The service offers a simple web interface where you upload a mix and receive a mastered version with customizable loudness and style settings. Beyond mastering, LANDR integrates with its distribution platform, giving artists a one‑stop solution to release music worldwide. It also provides access to a library of samples and plugins, making it a versatile tool for independent musicians and producers.

eMastered

An online AI-powered music mastering engine that provides fast, easy-to-use, and professional-sounding audio mastering, created by Grammy-winning engineers.

Waves Audio Plugins

Waves Audio Plugins provide a comprehensive suite of professional‑grade effects and processors used by engineers, producers, and musicians worldwide. The collection includes EQs, compressors, reverbs, and creative tools that integrate with major DAWs. Designed for both studio and live‑performance environments, Waves plugins deliver high‑quality sound, low latency, and extensive preset libraries, helping users achieve polished mixes faster.