JPEXS Free Flash Decompiler - JPEXS Free Flash Decompiler (FFDec) is an opensource Shockwave Flash (SWF) decompiler.
Ruffle - An open source Flash player
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.
Lightspark - The Lightspark project
Flare - Anonymously share & discover real-time events in your city
SuperNova Player - SuperNova Player allows systems to play .SWF files in a standalone player launched from any browser.