Godot Engine is a feature-packed, cross-platform game engine to create 2D and 3D games from a unified interface. It provides a comprehensive set of common tools, so that users can focus on making games without having to reinvent the wheel.
Godot Engine vs Kodu Game Lab opinions
Very simple for game development and I highly recommend for new people.
GDevelop is an open-source game making software designed to be used by everyone. Any kind of 2D games can be created with it and no programming skills are required to get started. Logic of games are made using visual events.
The most powerful game development platform is now available to everyone. Full engine source code. All features. No royalties. No obligations. No license fee.
The completely free and open-source game engine Defold solves the technical issues we all have in common when making games. That way, you can focus on being creative and building a great game.
Continuing the legacy of Mark Overmars' Animo and Game Maker, GameMaker: Studio is a proprietary game-creation system which can export to multiple platforms including Windows, HTML5, Linux, iOS, Mac and Android.
Scirra Construct is a 2D game development engine with a focus on building games visually. No programming is required though the software uses a visual method for event handling that relies on programming concepts like variables, loops and conditions.Discontinued
Construct 2 was taken off of the market in July 1, 2020, full support will be ceased in July 1, 2021. https://www.construct.net/en/make-games/buy-construct?action=c2retirement
ct.js is a 2D game editor (desktop app) based on web technologies. It aims to be an extensible yet simple game-making tool, accessible for both newbies and experienced game developers.
Cocos Creator is a complete package of game development tools and workflow, including a game engine (based on Cocos2d-x), resource management, scene editing, game preview, debug and publish one project to multiple platforms.