Cantabile - Plugin host for live performance.
SoundRadix Pi - PI is an innovative, multi-channel phase interactions mixer plug-in engine for Mac and PC.
VSTHost - Hostprogram for VST-Plugins with ASIO-Support
Voxengo PHA-979 - Track phase alignment audio plugin. Allows you to time- and phase-align any sound material to achieve better sonic coherence and clarity in the mix. Includes multi-band correlation meter.
Gig Performer - Gig Performer is a cross-platform audio plugin host for live music performances
MFreeformPhase by Melda Production - A powerful audio utility that lets you adjust the phase of individual frequencies however you like.