GDevelop is described as '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' and is a very popular game development tool in the development category. There are more than 100 alternatives to GDevelop for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best GDevelop alternative is Godot Engine, which is both free and Open Source. Other great apps like GDevelop are Unity, Wick Editor, Scratch and Construct 2.
Fibbo is a free and open-source web-based game engine that allows you to create interactive experiences using JavaScript, right in your browser.
Stride (formerly Xenko) is an open-source C# game engine designed for the future of gaming. It comes with a full toolchain and is especially well suited to create realistic games but allows you much more!.
Suite for building 2D top-down role-playing games with detailed map, tile, and sprite editors, traditional turn-based mechanics, dialog and encounter tools, custom scripting, asset support, and publishing options, suitable for both beginners and advanced users.
Very limited for game genres, mainly oldschool, topdown action-RPGs. Hardly any other kind of game possible.
The most powerful game development platform is now available to everyone. Full engine source code. All features. No royalties. No obligations. No license fee.
A extremely powerful application to make games in python as well as in visual programming
Browser-based 2D game creation engine using a visual event-driven system, integrates JavaScript for advanced development, requires no installation or prior programming, supports exporting to HTML5, mobile platforms, Xbox One, and enables real-time editing on any device.
No coding required, we can develop our games in a very similar event system and export to desktop, mobile and HTML5
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.
It's so similar to Gdevelop but need some coding
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.
cocos2d-x is a cross platform open source free 2D game engine for mobile gamedev, that is fast and stable, easy to learn and use.
Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
One framework for creating powerful cross-platform games. The spiritual successor to XNA with 1000's of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes.
RPG Paper Maker is a free game maker engine including a 3D universe with many 2D sprites and some simplified 3D objects. Pretty close to the RPG Maker series, RPG Paper Maker finally give a way to create RPGs in a totally 3D universe as easy as it is in 2D!
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RPG Maker is only good at one thing and that thing is RPGs. It is still possible to make dungeon crawlers and strategy RPGs like Fire Emblem with this engine, but not platformers, racers (or kart games) and shooters among other genres. You are better off trying another engine that is vastly more accessible in that regard.