I created my own original system (called Battles&Balances) because I needed one for computer RPGs, and those designed for tabletop assume a human GM at the helm, able to improvise, change things on the fly and make value judgements. Things a computer is notoriously bad at. So I made one that allows me to balance things well from the start and be reasonably certain of the chances players have, and also that they can *tell* how they're doing and run away if needed before a lucky roll by an enemy kills them without a chance to react. But I made it to use real dice and everything, because that keeps the design grounded. Plus, it was fun! And as a bonus, if people don't mind the extra crunch they can also play it without a computer, which is good for testing if nothing else.