Soundspear updates free "Formula" Audio Effect IDE - Linux Support
Soundspear has released a Linux version of Formula, a free and open-source integrated development environment to create, debug and test your own audio effects live inside a DAW.
Version 1.1.3 added support for the Linux platform through VST and VST3.
Formula Cloud, an effect catalog for Formula, has also had a price adjustment from $49.90/year to $19.90/year.