miRack comes with more than 600 modules by various developers. Modules are organised into module packs (also called plugins) and also into categories based on their function(s). Most of the modules were initially developed for VCV Rack and then ported to miRack.
This page gives an overview of available modules, it doesn’t show all of them. Many developers accept donations, you can find donation links below and on the Acknowledgements screen in the app.