Still a few great ones hanging around, like WBER in Rochester: https://wber.org/
Discovered WITR not too long ago, their selection is right up my alley (although it is arguably "millenial radio" rather than "college radio")
I treasure Radio On Internet (thanks Russ (Silicon Valley joke)) so much. There's so many less but still so many independent/community/college radio stations all over.
On the west coast, https://kexp.org of course. https://kcrw.com and their HD2 channel.
Middle of the country, https://wwoz.org jazz/blues/local is incredible (so help ye who has to listen through the local music announcements though!) and also with a hd2. https://ksjd.org has some fun variety. https://coloradosound.org is great rock, as is https://koto.org in CO. There's nearly nothing that makes me so happy as https://mountainchill.com in telluride co; a station that makes it clear how narrowly grouped together most stations are & that just is so good.
Coming closer to me, https://wtmd.org rock in Baltimore md, https://xpn.org in Philly for more. https://wzum.org jazz in pittsburgh pa. https://wdvx.com in knoxville tn.
I also listen to a bunch of others, which i'd characterize more as tier 2; good but often more ads or less reliable a win for me. weqx, wmrw-lp, kozo-lp, weru, wmpg. wsri and wwod (both "the river" 93.9, and occasionally from the right elevation in NH overlapping in signal amusingly enough).
A lot of these stations have good track listings too, broken down by the DJ, sometimes that you can play on demand. It's incredible how much excellent interesting fantastic music you can scout out or listen to.
I used to listen to endless endless reams of shoutcast stations online. But man that has really really died out something fierce. There used to be so many interesting niche stations there. It still got me started looking widely at radio stations, as a decent fraction were just regular radio stations too. Realizing how badly commercial radio would never give the goods, would play the same pop stuff all the time, and have lots of ads? Man it was sad, but there were so many excellent other things to tune into! Alas on the dial, it's largely been couple massive corporate and political/religious (all very right-wing, Powell Memorandum on and on) titans taking over as much radiowaves as they can, as stations fold and go under, in the hard times of keeping your head up in the world today, getting the building, gear, and staff's bill's payed. (Especially with the administration trying to destroy the arts broadly, gutting National Endowment for the Arts!)
I'd absolutely love for folks to throw more stations they enjoy out here. https://radio.garden is of course wicked fun to browse generally! Gets submitted every so often, often garnering some significant love. https://hn.algolia.com/?q=radio.garden
Adelaide, South Australia: https://threedradio.com/
Fiercely local, fiercely independent. Has been great for new music discovery for me for years.