Lingon

onethingwell:

Lingon is a graphical user interface for creating and editing launchd configuration files for Mac OS X Snow Leopard. You can use launchd on a Mac to launch scripts and applications whenever something special happens or at a specific time or periodically.

Writing launchd files by hand is a right faff, so it’s great to see Lingon return.

Update: I just finished converting all my cron jobs to launchd with Lingon—it took about five minutes, and gave me a few ideas for Hazel-style automation tricks too (launchd can respond to changes in files and folder contents).