The Flixel Power Tools are a set of plug-ins for Flixel 2.5+
...The Flixel Power Tools come with a comprehensive Test Suite. Use it to visually see the tools in action, and then learn from the source code and comments within. Documentation is also provided for the classes. AS3 IDEs such as FlashDevelop will provide context-sensitive help for all classes and functions in the Flixel Power Tools.
Trivia Warrior Game Engine is used to power Flex / Actionscript based Trivia Games. By utilizing this Game Engine you can quickly create your own Trivia Game.
SharpFlash is a third-party tool allowing Flash applications to have more power on operating systems supporting the .NET Framework. It exposes an ActionScript API to allow things like file access, registry access, etc. Written in C#, with a Flash UI.