There's a ton of stuff, especially if you expand from just trios to multi-horn groups
Sonny Rollins - Besides W.O.W. and the Vanguard record he has a ton of chordless records. Favorite trio dates of mine include the Freedom Suite, Aix en Provence (with Kenny Clarke), the trio half of S.R. and the Big Brass, East Broadway Rundown, and Stockholm 1959. If you can find the Complete RCA Victor box, that has several trio sessions, as well as the epic Our Man in Jazz date, quartet with Cherry, Cranshaw and Higgins (look for the complete version of that session too, the RCA box "only" has the originally released three tunes). And there are plenty of other bootleg things plus a lots of amazing video too
Joe Henderson - Besides the Vanguard records with Ron and Al Foster there are several live dates with Al and Charlie Haden (my favorites are the An Evening With dates), a studio date with Al and Rufus Reid and something from the 70's with Wayne Darling and Ed Soph, Barcelona. There are also some nice videos with Dave Holland
Elvin Jones - There are a lot of chordless Elvin sessions, starting with the trio with Jimmy Garrison and Joe Farrell, a couple of records (Puttin' It Together and The Ultimate) and some great videos too. There are several live trio things with George Coleman and Wilbur Little and a great quartet record called Coalition with those two and Frank Foster and Candido added. Also, Live at the Lighthouse with Liebman, Grossman and Gene Perla (some video too) and there are few trio tunes on Heavy Sounds
Max Roach - M.R. Plays Charlie Parker and part of Max Roach + 4 have quartet stuff with Hank Mobley and Kenny Dorham and either George Morrow or Nelson Boyd. And in the 60's Max had two classic chordless quintets, one with George Coleman, Booker Little, Ray Draper and Art Davis, and one with the Turrentine bros, Julian Priester and Bobby Boswell. There's video of both groups. And his last group with Odean Pope and Cecil Bridgwater, they made a lot of records
Mingus - Mingus presents Mingus and the Mingus at Antibes record
A quick look through my collection finds piano-less things by Bennie Wallace, Ernie Henry/Kenny Dorham, Charles Lloyd, Don Byas (the Town Hall stuff with Slam Stewart), Joe Lovano, Lucky Thompson, and Yusef Lateef, among a whole lot of other stuff. If you expand from bebop into freer styles then a whole other world of stuff opens up, Ornette, Ayler, Steve Lacy, Old/New Dreams et al. And for a guitar trio record, for me it starts and ends with Kenny Burrell's A Night at the Village Vanguard, with Richard Davis and Roy Haynes, so amazing
