Cantabile - Plugin host for live performance.
VSTHost - Hostprogram for VST-Plugins with ASIO-Support
Gig Performer - Gig Performer is a cross-platform audio plugin host for live music performances
SAVIHost - Make VST instrument plugins into standalone apps.
DDMF Metaplugin - Metaplugin is a plugin that loads other plugins. As simple as that. Build your own effect networks with this plugin wrapper using any VST/VST3 (and AU, if you’re on Mac) effect you already have on your harddisk.
Vienna Ensemble Pro - The definitive cross-platform network mixing and routing solution