GemRB is described as '(Game Engine Made with preRendered Background) is a portable open-source reimplementation of the Infinity Engine that underpinned Baldur's Gate, Icewind Dale and Planescape: Torment. It sports a cleaner design, greater extensibility and several innovations' and is an app. There are more than 50 alternatives to GemRB for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best GemRB alternative is Godot Engine, which is both free and Open Source. Other great apps like GemRB are Unity, Unreal Engine, GDevelop and Wick Editor.
Amethyst uses gfx-rs to render graphics with Vulkan or Metal. It is meant to be used for 2D and 3D, with various utilities for both types of games. It should be beginner friendly but also allow more advanced uses such as custom render passes and GLSL shaders.
Buildbox is a breakthrough game creation experience. Creating games is as easy as dropping images into the software, making changes to their properties and hitting play.
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.
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