PuzzleScript is an open-source HTML5 game engine that provides a scripting language allowing you to build your very own puzzle games, entirely within a browser.
It's not a general purpose game making tool, it's not even a general purpose puzzle game making tool. Or even a avatar-based turn-based puzzle game making tool - games like DROD don't work, or games with very nuanced behaviours, like Puzzles proved impossible. But it is a tool, and I think it might prove handy/enabling for a number of people, if one is accepting of its limitations.
I've worked on a lot of puzzle games, and decided on a particular group of those that could be handily modelled with a scripting language. I've seen someone do a similar pattern-matching system before (I can't remember who, though), but it was a lot less flexible - the movement system in this engine is what gives it its real power.
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