OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
JPEXS Free Flash Decompiler - JPEXS Free Flash Decompiler (FFDec) is an opensource Shockwave Flash (SWF) decompiler.
Synfig Studio - Just another WordPress site
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SWFTOOLS - SWFTools is a collection of utilities for working with Adobe Flash files (SWF files).