Lingon is a graphical interface for creating launchd configuration files and controlling them through launchctl for Mac OS X Tiger. (launchd is a system daemon that is used to run scripts/programs automatically, repeatedly or at certain times.) You get all your launchd configuration files listed in a table so you easily can see which are loaded and what they do, and you can also load and unload any easily. If you want to create or edit a launchd configuration file you can do that in Lingon through an assistant or in an easy graphical way (or through an built-in text editor, should you want to).
1) Click on 'Assistant' in the Lingon's toolbar.
2) Check the 'Keep an application/script always running' option.
3) Input 'net.sf.gcaldaemon' label, and leave 'Launch only when I log in' checked.
4) Click on 'Path' button, then select the '<gcaldaemon's root directory>/GCALDaemon/bin/standalone-start.sh' script.
5) Click on 'Create' button.