Open-source Chromium extension and 8-band studio parametric equalizer integrated directly into YouTube & Youtube Music.
Powered by my own fork of weq8 called WEQ8C, which replicates look of Ableton Live's "EQ Eight" equalizer.
The extension code is open source and available for any non-commercial or commercial reuse under the MIT License.
The equalizer core and UI are powered by weq8 fork, licensed under the ISC License. The license text is available in THIRD-PARTY-NOTICES.txt.