Cocos Creator (App)
Cocos Creator is a free open source game engine that can be used to create 2D and 3D games, as well as interactive 3D applications.
Posted in2D Art Resource Free Level Editor Open Source
LDtk – Level Designer Toolkit (App)
LDtk (Level Designer Toolkit) is a free and open source 2D level editor developed by Sébastien Benard, the former lead developer of Dead Cells.