prostheticknowledge:

GameSalad - Mac-based HTML5 Game Maker with Drag-and-Drop construction and iOS export - also free

Designed for designers.
There’s no faster or easier way to get started building a game than with GameSalad Creator. Its visual, drag & drop based style requires absolutely no coding whatsoever. Avoid spending hours poring over code, and spend more time finding the fun.

“Rapid” is an understatement.
GameSalad’s wide variety of complex behaviors provide almost limitless freedom for varied game genres, styles, and mechanics. On top of its incredible versatility, GameSalad brings a whole new meaning to the phrase “rapid prototyping”. Explore the possibilities in hours and days instead of weeks. It’s fast. It’s versatile. It’s GameSalad.

No coding. Ever.
GameSalad aims to open the doors of game design to anyone who wants to create. With GameSalad’s complete set of tools and editors, bring your game to market faster and easier than with any other development platform; and without coding a single line. That’s development in days and weeks - not months. That’s the democratization of game creation.

It doesn’t look like there is a version for Windows - definately Aplle bias.

http://gamesalad.com/