Game Salad

http://gamesalad.com/

Game Salad is a tool for Mac users to develop your own games and export then in any format you want. It's great for producers who are not familiar with coding to dive in and add some logic to a basic prototype and test your ideas.

It's in Beta so its still a little buggy for me and crashes a lot (but that could also be cause I have an older Mac), but it's pretty fun and helps you give a better understanding of logic without code.