Angel2D is described as 'A cross-platform 2D game prototyping framework based on OpenGL and C++' and is an app in the Development category. There are more than 10 alternatives to Angel2D for a variety of platforms, including Windows, Mac, Linux, iPhone and Online / Web-based. The best alternative is Unity, which is free. Other great apps like Angel2D are Unreal Engine (Freemium), Wick Editor (Free, Open Source), CRYENGINE (Free Personal) and ENIGMA - LateralGM (Free, Open Source).
Unreal Engine is a professional suite of tools and technologies used for building high-quality games across a range of platforms. Unreal Engine’s rendering architecture enables developers to achieve stunning visuals and also scale elegantly to lower-end systems.
The Wick Editor is a free and open-source tool for creating games, animations, and everything in-between. It's designed to be the most accessible tool for creating multimedia projects on the web. Your creations can run on any device with a web browser - that means mobile too.
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.
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.
An open-source 3D/2D game engine for ObjectPascal. We support of lot of 3D and 2D formats (VRML / X3D, Collada, Wavefront OBJ, MD3, Spine...), we're portable to a lot of platforms (Linux, Windows, Mac OS X, Android, iOS...