Wow!!
where do you start
lots of great material has already been mentioned
Have to mention the Ayler Revenant, Taylor 88 box & Mosaic again - all very special to me
add
AMM - The Crypt 3CD Matchless - any AMM fans out there?
Kuryokhin - Divine Madness 4CD Leo
Brotzmann Octet/Tentet 3CD Okkadisk
Blue Notes 4CD Ogun
Charles Tolliver Mosaic Selects
Albert Mangelsdorff - recent MPS boxes
The Necks - Althenaeum, Homebush, Quay & Raab 4CD Fish Of Milk (great Australian improv trio)
I have a real soft spot for Brit/Euro/Soviet jazz (esp free/improv) - both of my parents are Lithuanian, I was born in London & the family migrated (fortunately or unfortunately) to Australia in 1961
One of my biggest box set regrets was not getting the Leo Document Set - I remember dealing with Leo Feigin probably about 10 to 12 years ago - he had one set left but the cost of shipping & the exchange rate at that time made it prohibitive for me. You rarely see this set coming up for resale nowdays.