The best way to support this project is by installing it on your local server and test whether everything works as expected and post the results or feature requests to the bugtracker. Also the docummentation of Amun is very sparse and every help in making it more complete and understandable is much appreciated. You can also donate to support this project.
If you have problems and need quick help or simply want to talk about great ideas you can join the channel #phpsx on freenode.
If you want support Amun you can donate any amount where you feel good with. All money is for maintaining Amun that means paying server and domain costs. My private email adress is christoph at kappestein dot com. Thank you to all people who support this project!