Cantabile - Plugin host for live performance.
Voltage Modular - Virtual modular platform designed for flexibility and pro sound
VSTHost - Hostprogram for VST-Plugins with ASIO-Support
VCV Rack - A cross-platform modular synthesizer.
Blue Cat's PatchWork - Blue Cat's PatchWork is a universal plug-ins patchbay and multi FX that can host up to 64 VST, VST3, Audio Unit or built-in plug-ins into any Digital Audio Workstation (DAW) in a single instance, with both serial and parallel routing options.
miRack - Eurorack-style modular synthesizer for iOS.