The final 1.0 version of DiscoDOS was just released. I am sure a lot of Mixxx users are combining their digital music with Vinyl in their sets.
DiscoDOS is a command line tool that helps Vinyl DJs to organise their set-lists, find out key and BPM and search the collection. It’s based on a presonal record collection kept at discogs.com and uses musicbrainz.org and acousticbrainz.org for additional data fetching.
Download, install, read more: https://discodos.jojotodos.net
I have ideas in mind on how to integrate DiscoDOS with Mixxx, a first step approach is described here: https://discodos.jojotodos.net#roadmap.
Give it a try, tell me what you think!