Solar2D is a cross-platform game engine that uses Lua and offers a range of plugins, allowing developers to call native libraries and create production-ready games.
They have a library full of graphics that you can use for your title. This platform can also be used to design 2D games although it’s better if you use Fusion to create static ones.
Amazon Lumberyard is a game development platform created by Amazon that allows users to create and release games on various devices due to its cross-platform functionality.
Gideros is an open-source, cross-platform game engine that is free to use and allows users to launch games on different platforms without additional changes.
Godot is a completely free and open-source game engine with a permissive MIT license, giving users full ownership of their game and access to all engine code.
CRYENGINE is a powerful game development platform known for its high-quality visuals and range of tools for creating mobile games, with good developer support.
Phaser is a 2D game development platform for desktop and mobile that uses an open-source framework for Canvas and WebGL and has a fun and colorful design.
Defold is a cross-platform game engine for web and mobile that is easy to use with a range of features, focusing on 2D but also enabling 3D development.