faSampleDelay is the best free Phase Alignment Plugin out there. It's highly flexible UI lets you quickly find your preferred Time Alignment setting within a few seconds. Use it to compensate the time delays between multi-miked recordings with drums, bass, guitars, saxophone, double bass or cello. There are also a lot of people in genres like hip hop or EDM using it to align the bass to the kick drum or to create colorful transitions with a comb filter effect between different song parts. The choice is yours!
Available as VST / AU / AAXnative for Windows & Mac.
Requirements: Mac OS 10.10 above or Windows 7 above
Presonus Studio One
MOTU Digital Performer
(currently) unsupported DAWs: