FlashPunk is described as 'free ActionScript 3 library designed for developing 2D Flash games. It provides you with a fast, clean framework to prototype and develop your games in' and is a Game Development Tool in the Development category. There are more than 10 alternatives to FlashPunk for a variety of platforms, including Mac, Windows, Linux, Android and iPhone. The best alternative is LÖVE, which is both free and Open Source. Other great apps like FlashPunk are Pygame (Free, Open Source), nCine (Free, Open Source), GeeXLab (Free) and Heaps.io (Free).
Pygame is a 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.
Amulet is a Lua-based toolkit for experimenting with interactive graphics and audio. It provides a cross-platform API for drawing graphics, playing audio and responding to user input, and a command-line interpreter for running Amulet scripts.
A simple framework for creating VR with Lua. LÖVR projects work on Windows, macOS, and Linux. You can run the same code on an HTC Vive or an Oculus Rift, and there's even a drag and drop tool for exporting projects to WebVR.