Talking About Free, Stripped Down but Functional RPGs - Basic Roleplaying Quickstart
Sure, it says it's a "quickstart", but it includes rules for advancing your skill and it doesn't include an adventure, so really, it's a "basic" version of Basic Roleplaying (which is the system that CoC, RuneQuest, Legend, OpenQuest and a few other D100 systems are built from / off of / derivative of. It has it's roots in the original RQ and branched off of CoC if I recall correctly)
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...