Some months ago I gathered a sizable, mighty fine offline music collection from https://netlabels.org/electronic-music/ and https://files.scene.org/browse/music/ — plenty of "duds" in both too, but that's just called subjective taste preferences and personal collection curation =)
I could not agree more! Some of my very-most-favorite tracks ever, ultimately got to me via https://www.pouet.net and by being a demo soundtrack!! Demo music utterly rules!!!!
Especially so if you're into electronic styles, and even occasionally on a far less tech-y vibe too!
Some examples of less tech-y: "Number One Another One" by Fairlight & CNCD. "Ix" and "Assembly 2004 Invitation" by Moppi from a long time ago - these both have just such utterly-brilliant but very-chill music! And "Track One" by Fairlight too, and there are really loads of other things like these!
Demoscene tunes are not exclusively about bangin' techno, nor tracker-mod-arpeggios ('chiptune-sound') nor synth-leads a-la PM/Future Crew! In my opinion I think demoscene totally does make some of the best tracks in those areas though! (even basically defines the genres!).
I have a whole 'demoscene chill' playlist that I sometimes listen to while I go to sleep! There's loads of 'ambient' tunes out there in the demoscene amongst all the techno!
People from Fairlight were at the demoparty where I met my wife for the second time. They're nice.
Here's an old favourite demo of mine that ought to be easy listening to most:
Related to scene.org, https://www.pouet.net/ is also a nice resource for good music.