Cantabile - Plugin host for live performance.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
VSTHost - Hostprogram for VST-Plugins with ASIO-Support
FamiStudio - FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited.
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.
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.