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What non-FOSS software have you been unable to quit?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Last.fm, I guess. I use Libre.fm as well, but I don't quite get the same experience out of it.
I haven't tried last.fm but I like ListenBrainz for that stuff.