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Here we can discuss the original Tunnels & Trolls by Ken St Andre. Written in 1975, T&T editions 1 through 5.5 are essentailly the same beast.
Wee Warriors created several TSR-sanctioned products for OD&D back in the 1970's. Here we can discuss them.
Arduin was one of the first D&D variant rules system. Here are threads about Arduin.