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Relic has been particularly good at that. The missions and maps of their earlier work in particular, such as Dawn of War and Impossible Creatures, seem to have been made in a level editor program that they developed themselves and then released with the games. I found them fairly intuitive.
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Elder Scrolls, man. I think they once did a side-by-side comparison of Bethesda's development tools and the Construction Set. The difference was one subwindow.