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 / 5 months ago

Not open source, but free for "home use" https://virtualdj.com/. - Source: Hacker News / 5 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: over 1 year 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

I use Loopback for virtual audio sources. This is super helpful because I create an audio source, which is my microphone and the guest's (guests') audio, and treat it as one input source. I use this audio source as the audio source for live captioning. - Source: dev.to / 24 days ago

No, it's very easy: https://existential.audio/blackhole/ Blackhole is Free and Open Source. Also, Rogue Amoeba has a product called "Loopback". It's not cheap, but it's another alternative: https://rogueamoeba.com/loopback/. - Source: Hacker News / 8 months ago

This is the basic idea, but there are other apps which can make it easier. I prefer using Audio Hijack for the EQ part and sending it to a pass-through device set up in Loopback (which, for this use case, functions the same as BlackHole). Source: 8 months ago

- Loopback 2 by Rogue Ameba to create a pass-thru from the soundboard (Farrago, also by Rogue Ameba) to Skype so everyone can hear me talking in addition to the soundboard on the same line. Source: 11 months ago

At the risk of further complicating matters, you could try combining sources or otherwise experimenting with Loopback, an app that's designed to do all kinds of audio routing stuff. Source: 11 months ago