This appears to be a free PDF of a rules-lite version of BRP, and a mixture of CoC and Runequest.
I've thoroughly enjoyed going through this PDF.
I've even joined the forum on Goblinoidgames.com, and added some resources for the GORE rules.
Adaptable, easy, and free.
I've also found a PDF called Stress and trauma for GORE , which is helpful.
All in all, I'd recommend that anyone who likes a D100/percentage system, should give GORE a try, you won't be disappointed.