Niels Provos writes in that he has added Mac OS X support for Systrace, a sandboxing/application confinement tool that can be used to increase application and service security. It installs a new kernel to support /dev/systrace and the Systrace application, and a Cocoa frontend.
"All the people are so happy now, their heads are caving in. I'm glad they
are a snowman with protective rubber skin"
-- They Might Be Giants