During the time I was no longer actively playing RPGs but was most certainly buying and reading them, I found True 20. Heck, i was even played in a play by post True 20 game WAY back in the day, but getting caught posting from work kinda put a damper on that ;)
I think what I liked most about True 20 were the sample settings. Damn, I need to dig out that True 20 setting book (Worlds of Adventure) I have buried somewhere and convert one or two of them to Swords & Wizardry. Should be easy enough, as they were mostly fluff if I recall correctly.
Shame it pretty much is "abandon-ware" these days. I think the surge in popularity that Savage Worlds went thru, as well as the pull back on D20 games in general, pulled the rug out from under True 20.
The Minotaur for Old-School Essentials
*Requirements:* Minimum STR 9, Minimum CON 9
*Prime Requisite:* STR and CON
*Hit Dice:* 1d10
*Maximum Level:* 8
*Armor:* Leather, including shield...