Alcon

Alcon is a lightweight logging and debugging tool for Flash developers who want to quickly get debugging information from their projects.

It offers an easy to use API for use in your source code which sends debug information to an output console from any kind of Flash-based runtime, be it the web Flash player, the standalone Flash player or the AIR runtime.
Besides simple logging, Alcon comes packed with several other useful features like an app monitor to watch your application's framerate and memory consumption, an object inspector to check object properties, a stopwatch, a feature to quickly check key and character codes and a lot more.