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Scirra's Construct is somewhat like a freeware version of Clickteam's products. With too much pixel shader stuff added, that most games you will find use far too much of. The program's not at version 1 yet, so there haven't been lot of good games made to show it off, and there are some stability issues.
For people that don't quite click with Game Maker it is, already, a good alternative to the Clickteam software line, especially if you know enough C++ to make your own plug-ins. There is also some rudimentary 3D support.