The "glory years" identified were my Jr & Sr years of high school . . .
The "other" things in circulation at the time were largely either supplements to the the original booklets (and supplements), such as Arduinn, Spellcaster's Bible, and Runequest (farther removed), or completely orthogonal, such as Travellers & Runequest (also TSR).
A bit of this, a bit of that, a few articles from Dragon, and so forth.
And the moronic arguments as to which system handled dragon breath more "realistically", for crying out loud. D&D (blast goes off in the middle of people, but the second row doesn't get shielded from the first) or something goes off between two people, but one takes half as much damage as if the other wasn't there (Arduin)
hawk, who has the original Arduin supplement somewhere (before the bra was added)