Apps similar to Joiplay include Godot Engine, which is free and open source. Other options are GABE, Redot Engine, microStudio and Bevy Game Engine. You're spoiled for choice with Game Development Tools like Joiplay: we list more than 25 alternatives for Windows, Linux, Mac, the web and Android.
Limon is a multi platform 3D game engine mainly focusing on first person games. Focus of its development is ease of use and ease of study. It has builtin editor for maps, animations and GUIs.
Dart RPG is an open-source, browser-based 2D RPG and game editor. It's basically a game maker you use in your browser to make 2D tile-based RPGs, which are saved into and loaded from JSON files.
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