I don't have much left from the old days. All of my D&D, AD&D, Gamma World and Top Secret stuff disappeared or was destroyed at various times. About all I have left is my Classic Traveller books and my Melee/Wizard games. The last may not count because I never owned or played In the Labyrinth.
Several years ago I purchased the GURPS 3rd edition core book and the Gurps Traveller, Imperial Rome, Space, Transhuman Space, and Low Tech supplements. I've never played.
My recent resurgence of interest has prompted me to buy Mongoose Traveller, Savage Worlds, Slipstream, and 3:16 in hard copy. I have Supercrew, BASH, and WEG Star Wars 1st Edition on the way. I've also purchased PDFs of Barbarians of Lemuria, Broadsword, and HardNova II. I liked the read-through of BoL so much that I am going to get it in paper-version when the new edition comes out in December.
I've downloaded a bajillion free PDFs. Of these, I've printed out Labyrinth Lord, Basic Fantasy, ZeFRS, Mazes & Minotaurs, and 4C. Of these, I've only played a little Labyrinth Lord.
And you know what? I want MORE!