Looking to make games? Defold is a pretty great option that has wonderful cross-platform support and it's free too, available under a pretty open license (but not open source).
With an editor that's available across Linux, macOS and Windows so you can develop anywhere you like. It can also export games to all three and HTML5, Android and iOS as well. A fully featured game engine, with the source code available to view if needed.
"Defold is a completely free to use game engine for development of 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."
Quite a capable game engine that mainly targets 2D games with support for OpenGL, Vulkan and Metal. It has fully scriptable rendering pipelines with low-level access, a particle effects editor, 2D and 3D particle effects, spine models, a tile editor, a full extension system, Lua scripting and Haxe support, 2D and 3D physics (Box 2D and Bullet) fully integrated and much more.
It's been around for a long time and now with it on Steam, perhaps more developer will take a look. What games have been made with it? Some more recent commercial indie game releases include Fates of Ort, Interrogation and Faerie Solitaire Harvest.