So many fine solo recordings and without even mentioning Evan Parker, Anthony Braxton and Roscoe Mitchell (who each probably deserve a solo recordings thread to themselves), here's some great ones from my collection that get revisited often
Peter Brotzmann - 14 Love Poems [FMP]
Joseph Jarman - Sunbound Volume One [AECO]
Famoudou Don Moye - Sun Percussion Volume One [AECO]
Brother Malachi Favors Magoustous - Natural & Spiritual [AECO]
Arve Henriksen - Sakuteiki [Rune Grammofon]
Sabir Mateen - Ardla XXX [Rogue Art]
Jerome Cooper - Unpredictability Of Predictability [About Time]
Nicole Mitchell - Engraved In The Wind [Rogue Art]
I'll second the Gunter Sommer, Marion Brown, Vinny Golia and Steve Coleman mentions above