Gamebryo is a flexible, cross-platform game development engine and toolset, optimized for current- and future-generation game development in any genre. Gamebryo accelerates your project, whether you’re creating your prototype or first-playable, streamlining your production pipeline, or targeting multiple consoles.
Good but crashes a lot.
9/10 because both Morrowind and Oblivion uses it. I don't know much about this engine except that Zoo Tycoon apparently also uses it which makes things really confusing. It seems like a decent engine by looking at Morrowind and Oblivion.
IT ROCKS!
Bad engine that is very bad.