To "live DJ" there's the extremely famous https://virtualdj.com/ To create prerecorded DJ sets https://www.mixmeister.com/ Been using both for at least 10 years, love them both. - Source: Hacker News / 6 months ago

Not open source, but free for "home use" https://virtualdj.com/. - Source: Hacker News / 6 months ago

I started with Virtual DJ to get used to the software latency (I came from turntables) and get my muscle memory on button locations (which is why I stayed with the same brand). VDJ has every feature you need. The software is free to use without a controller from virtualdj.com. Source: almost 2 years ago

A lot of the places that do it from scratch I notice use https://virtualdj.com/. Source: almost 2 years ago

DJ software, like VirtualDJ will have features that are more conducive to what you're trying to do, like live looping functions that help you lock the loop to the beat. It's also cheaper (free for non-commercial use without a hardware controller) than QLab, and it's cross-platform (QLab is Mac-only, if that matters). Source: about 2 years ago

Synthesia https://synthesiagame.com/ As a vistual learner and grapgical thinker, those music score on paper are all bullshit to me. Only this can help me out. You can import your own MIDI into it. Practice the shit out of it and at least can play 1 or 2 fairly advanced songs. - Source: Hacker News / 5 months ago

I suggest using Synthesia instead. Doesn't require a VR headset, is not made by Facebook, and does the same job. Source: 7 months ago

I've got Synesthesia installed, which is pretty good (and has a free version) but doesn't show hand positions and has a limited number of song options. Source: 8 months ago

Synthesia has done this exact solution for well over a decade now. But there’s also the option to read generated sheet music and adjust the playback and gradung in many ways. https://synthesiagame.com/. - Source: Hacker News / 9 months ago

If you have a keyboard try using Synthesia! Source: about 1 year ago