For me, the other Old School systems that hold that special place for me are Tunnels & Trolls and RuneQuest - 5e and the Chaosium versions respectively, but I can make allowances for later editions. Oh, and Traveller too. Not Mega, not 2300AD, but the true Traveller of the little black books.
If they are going to find any modern love, it would be in Old School Quarterly, which should have an issue Zero this summer.
Ya gotta share your Old School love +Jason Paul McCartan . You never know what the future may hold. Tell us the Old School games that hold a special place in your heart.