The OpenAMF project is a free open-source alternative to Macromedia's Java Flash Remoting.
It is as capable of providing application services to Flash MX as Macromedia's proprietary solution.
This project began as a Java port of AMF-PHP.
Printr Debugger is an Actionscript implementation of the "print_r" function from PHP. It has a lot of options, the results are presented in the Output Window or in the Printr Debugger Flash Panel. It offers remote inspection too.
Flash xPath is intended to be a solution to the lack of an xPath standard model in flash MX. Any one who has used xPath usually appreciates the ease of use it offers by its self or in conjunction with a DOM based parser.