I'm no good at making lists, but here are some things that came to mind--
Quartette Tres Bien - Boss Tres Bien - propulsive '60s rhythm section out of St Louis.
Keynote Jazz Collection 1941 - 1947 - beautifully recorded encyclopedia of small group swing on a small independent label that includes famous sessions with Lester Young, Coleman Hawkins, Roy Eldridge and plenty of lesser known greats getting to step away from big band work; there's even some early bop & Tristano's earliest sessions.
Bill Frisell - Richter 858 - third stream meets minimalism in the best ways.
Buck Clayton - Jam Sessions on Columbia - these have been issued under a bunch of different names over the years (& to make things more confusing, Buck would lead additional jam sessions in the '70s for Chiaroscuro) but the idea in the '50s was to get a mix of great & underheard players from the '30s & '40s then let them stretch out on arrangements with way less grandstanding than the concurrent Jazz At The Philharmonic recordings.
Terje Rypdal - Terje Rypdal - ambient fusion funk, gave me a new appreciation for ECM.
Eric Kloss - Sky Shadows In The Land Of The Giants - have no idea why this saxophonist is so neglected despite having recorded a bunch of strong albums in the '60s & '70s, to me he comes across like an edgier Paul Desmond. Also has crack backing by Jaki Byard, Richard Davis & Alan Dawson.
Anachronic Jazz Band - Back In Town! - french band that dresses bebop tunes in dixieland arrangements, gimmicky but charming. Wanted to post their version of Mingus' "Remember Rockefeller At Attica" but it doesn't appear to be on youtube & the other clips don't do them justice.
If you use slsk, feel free to message me at uhwelluh & I'll add you to the downloads list.