The VST plugins listed on this site's audio plugins page are all open source software.

The plugins are either built on top of Steinbergs VST SDK or the JUCE framework and can be built for Windows, MacOS and Linux platforms.

The plugins run in any VST3 compliant host/DAW with the macOS versions also offering support for the Audio Unit format. The plugins built using Steinberg VST SDK can also be built in the legacy VST (2.4) format if you have the appropriate license.

Both instruments and sound processors are available, where all instances separate model state management, UI controls and audio processing into separate classes.

Each of the repositories contains a shell/batch script to generate the plugins for the appropriate platform, with options to compile for both Intel and ARM architectures on macOS or even support legacy 32-bit architectures for all musicians who maintain legacy systems.