OGL systems

So when your writing your RPG, which system do you use?
One of your own or someone elses?
With OGL things have become a lot easier in using the second option. Lots of systems are now available for you to use without paying huge sums of money to another company.

Here is a thread on RPG.net with lists and links to many of those available. Check out whats available and then you can really consider if its worth spending all that extra time making your own system.

http://forum.rpg.net/showthread.php?t=359474

Here is a website that lists lots of free RPGs, including open license ones.

http://www.darkshire.net/~jhkim/rpg/freerpgs/bykeyword/open-license.html