If you are okay with spending money I would HIGHLY suggest reFX Nexus with the "edm" and "future house" packs (this is basically the only thing I use personally). Source: almost 2 years ago

Ya it’s right here all you have to do is click buy now 💀https://refx.com/nexus/. Source: about 2 years ago

I noticed nobody said Nexus yet - so here you go. Source: over 2 years ago

The whole package has to fit, so we could recommend something like "just get Nexus 4 and the expansions you think would work and be done with it" but then you're also still mostly sifting through presets, albeit more polished ones. Stock plugins tend to have to appeal to a large audience, which is why you get something from everything instead of exactly the stuff you need. Source: over 2 years ago

Nexus 4 has the same issue w.r.t. size: https://refx.com/nexus/ . 26 GB for the base, 200 for all the expansions, not to mention the cost of each. Source: over 2 years ago

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