Some useful or interesting links:

The Worldwide Panorama Site
The Music Of Sound
Archive.org
Raidolab
Audible
Modular Station
Must Calculate: Circuit design calculators

The Mems Project
Random*Source
Electronotes
Synth DIY repositories
Serge Modular Synthesizer Info Ty Hodson

Synth DIY

Ken Stone’s Cat Girl Synthesizer (WILI archive)
ModWiggler Synthesizer forum
Electro-Music forum
Smallbear Electric
synthCube
Modular Addict
Thonk
Elby Designs 4U
Prism Circuits
Loundest Warning