JPEXS Free Flash Decompiler - JPEXS Free Flash Decompiler (FFDec) is an opensource Shockwave Flash (SWF) decompiler.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Flash Decompiler Trillix - SWF Decompiler Trillix allows you to decompile SWF (Flash), convert SWF to FLA, extract SWF elements and edit SWF file. Supports AS 3.0, Flash CS6 & CC and Flex.
Unity - The multiplatform game creation tools for everyone.
SWFTOOLS - SWFTools is a collection of utilities for working with Adobe Flash files (SWF files).
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.