OtsAV DJ, a DJ tool that allows DJs to seamlessly mix audio and visuals in an efficient way, is the best.
It uses its own video and audio mix technology called "Intelligent Automated Fade mixing" and "Intelligent Automated Beat mixing". You can control it directly by touching the screen or any MIDI controller.
OtsAV DJ makes it easy to add karaoke tracks and clips to your creations. There are also dozens of other effects, clips, images, and videos that make this possible.
OtsAV DJ can be a great application for DJs. However, it is not easy to learn.