Defold

Defold is a completely free to use game engine for development of console, desktop, mobile and web games. There are no up-front costs, no licensing fees and no royalties. The source code is made available on GitHub with a developer-friendly license. 

The Defold editor runs on Windows, Linux and macOS and includes a code editor, debugger, profiler and advanced scene and UI editors. Game logic is written in Lua with the option to use native code to extend the engine with additional functionality. 

Defold is used by a growing number of developers to create commercial hits as well as games for game jams and in schools to teach game development. Defold is known for its ease of use and it is praised for its technical documentation and friendly community of developers.