Godot 3

Godot is an advanced, feature-packed, multi-platform 2D and 3D open source game engine.

Create games with ease, using Godot's unique approach to game development.

• Nodes for all your needs. Godot comes with hundreds of built-in nodes that make game design a breeze. You can also create your own for custom behaviors, editors and much more.
• Flexible scene system. Create node compositions with support for instancing and inheritance.
• Visual editor with all the tools you need packed into a beautiful and uncluttered context-sensitive UI.
• Friendly content creation pipeline for artists, level designers, animators and everything in between.
• Persistent live editing where changes are not lost after stopping the game. It even works on mobile devices!
• Create your own custom tools with ease using the incredible tool system.

Limitations of the Flatpak version:

• No C#/Mono support. See (links to Godot 4 repo): https://github.com/flathub/org.godotengine.Godot/issues/8