Construct - Free and open source creation tool

[liam_d]

From their website

A free open-source DirectX game creator
with a powerful drag-and-drop interface,
making game development easy.

That needs changing really since you can also create applications with it. When you make a new project you can select either a directx or application layout style to use (application has less options available so it's binary will be smaller for example).

Screenshots:
http://www.gullen.pwp.blueyonder.co.uk/scirra/construct2.png
http://www.gullen.pwp.blueyonder.co.uk/scirra/construct3.png

Website -> http://www.scirra.com/

(I am not a developer of it or anything, just a user)