Apps similar to Valkyrie Engine include Godot Engine, which is free and open source. Other options are Unity, Unreal Engine, GDevelop and microStudio. You're spoiled for choice with Game Development Tools like Valkyrie Engine: we list more than 50 alternatives for Windows, Linux, Mac, the web and Android.
AresEd is a high-level and fully featured 3D game creation suite. It is Free and Open Source. When it is finished you will be able to make full 3D games without writing any code (although a fallback to the python scripting language will be provided).
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Lunar Engine is a free, open source 2D Online RPG maker software suite that enables you to rapidly create spectaclor online worlds from your imagination to the computer screen.
GameCraft (formerly Robocraft X) is a game maker where you can build your own physics games from blocks and components without the need to write code. You can also play many games that have been created and shared by others in the community.
Atavism opens up development opportunities of virtual online worlds to everyone regardless of programming knowledge or artistic ability.
S2 ENGINE HD is a complete general-purpose software kit for developing and running video games.
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