Cantabile - Plugin host for live performance.
VSTHost - Hostprogram for VST-Plugins with ASIO-Support
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.
Gig Performer - Gig Performer is a cross-platform audio plugin host for live music performances
Pure Data - Pd (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical...
SAVIHost - Make VST instrument plugins into standalone apps.