Various resources related to developing plugins for audio production.
A collection of links and resources related to Audio-Plugin-Development (VST, AU, AAX), including some signal processing.
This list curated by Oli Larkin may also be of interest. (https://github.com/olilarkin/awesome-musicdsp). Also this one by Ocean Swift (https://github.com/OceanSwift/DSP-Links-Resources)
Link != endorsement.
Mainly concerned with modelling compressors, channel strips, EQ's, and guitar amps.