Pygame is described as 'set of Python modules designed for writing video games. Pygame adds functionality on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language' and is an app in the Development category. There are more than 50 alternatives to Pygame for a variety of platforms, including Windows, Mac, Linux, iPhone and iPad. The best alternative is Godot Engine, which is both free and Open Source. Other great apps like Pygame are Unity (Freemium), LÖVE (Free, Open Source), Torque 3D (Free, Open Source) and OGRE (Free, Open Source).
General Features Capable WYSIWYG editor IntrinsicEd Fully multithreaded renderer and engine core Data oriented engine design and data driven rendering process, inspired by the great blog posts of the Bitsquid/Stingray team  Hot reloading of textures...
GameplayKit is an object-oriented framework that provides foundational tools and technologies for building games in iOS, macOS, and tvOS using the Swift programming language and 3rd party rendering and multimedia libraries such as SpriteKit.
Mycosm is a platform for creating 3D applications, designed to be used by a broad range of developers for many industries. For example, games, engineering simulation, education, visualization, decision support etc. Mycosm consists of a studio tool and freely distributable player.
Moai SDK is an embeddable cross-platform game development SDK written in C++ and scriptable in Lua. You can use Moai to write games or apps, or you can embed Moai in other programs. You can also use Moai as an overlay in your apps.
SpriteKit is a general-purpose framework for drawing shapes, particles, text, images, and video in two dimensions. It leverages Metal to achieve high-performance battery-efficient rendering and 2d games and other graphics-intensive apps.
Imagine Engine is an ongoing project that aims to create a fast, high performance Swift 2D game engine for Apple's platforms that is also a joy to use with an ambitious but clear goal - to enable you to easily build any game that you can imagine.
Simurban® is a 3D simulation software suite that allows users to create, view and interact with accurate and photorealistic models of any built environment. Ideal for development assessment, strategic planning and design.