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

Get instant access to the song’s chords or tabs on Ultimate-Guitar.com. Source: 8 months ago

I'm currently trying to find tutorials on how to find the right chords for certain songs and all I land on are a bunch of chord songwriting tutorials (which are quite useful, but aren't necessarily what I'm directly looking for). The chords, even the sheet music, aren't publicly available nor has someone made a guide for them on websites like Ultimate Guitar. Someone could tell me to spend all day and night... Source: 11 months ago

Pick 2 or 3 doom songs you love that are nice and slow and easy and look up the tabs on ultimate-guitar.com. Source: 12 months ago

I bought my first guitar around 18 months ago, because I didn't have any hobbies and playing a musical instrument seemed like a good start, since I absolutely love the sound of the guitar and bass in about every song I hear, primarily in all songs by my favorite bands Muse and Royal Blood. Now, I have already accepted that I won't be the next Matthew Bellamy... But after playing the guitar for the first time 18... Source: 12 months ago

Also, ultimate-guitar.com is your best friend when it comes to notes and tabs. Source: about 1 year ago