What are some alternatives?
When comparing Kodu Game Lab and GDevelop, you can also consider the following products
Scroller Game Creator - Create your scroller shooter game
Unity - The multiplatform game creation tools for everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Tululoo Game Maker - Tululoo Game Maker is a complex game creation environment that allows you to create browser based...
Stencyl - Make iOS (iPhone/iPad), Android, Flash, Windows & Mac games without code using Stencyl.
GameMaker - "With GameMaker, I went from no programming knowledge to full-time developer in 2 years!" Seth Coster - Butterscotch Shenanigans - Crashlands. "GMS 2 is absolutely amazing and I cannot get over how great this software is to use".