rekordbox 

Play, edit, and mix your music tracks. Apply various sound effects, generate your own playlists, and use such filters as a title, artist, BPM, and label to search your music collection. Specify the beat levels for each loop, shrink and expand beat intervals, and change the BPM value.

Nowadays, DJs don't show up anymore, or very rarely, at parties, with CD cases or vinyls and simply load them to start the party. They use software that connects them to music libraries where they select tracks and mix them. One of these tools is Rekordbox. Rekordbox allows users to better manage their music library by letting them create a playlist so they can use it later at a party or live show.

The application comes wrapped in a beautifully crafted theme, with a black background color, lots of tabs, mini-menus and tool options. It may be confusing at first use, so arm yourself with patience if you've never used DJ tools. Some menus seem badly placed and the text is a bit too small. Also, the program does use a significant amount of system resources.

As per its features, Rekordbox comes with cloud music management, a function that lets users efficiently manage their Rekordbox library from different devices by uploading tracks and playlists to the cloud. Furthermore, if you want to get creative, you can use the program's DJing tools to sync the tempo of the tracks, mix tracks from streaming services, and perform song analysis to find rhythm patterns. Also, the program includes lots of visual effects for mobile DJs that work at events where they can sync videos, images, animations, and lyrics with the songs to create the perfect environment.

All things considered, rekordbox is a comprehensive DJ utility for managing music libraries. It comes with minor cons only, so you should definitely try it.