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I agree Photoshop sets the expectations high. But I don't agree that a non-commercial product cannot reach that level. Take a look at Blender.

That's probably not the best example, as Blender was initially closed-source until the creators went bankrupt. http://en.wikipedia.org/wiki/Blender_(software)

But it's been open source for 8 years and under active development:

There can't be a huge amount of the original source left, surely?