Use Outside Mac OS X
A port to FreeBSD was done as part of Google Summer of Code Project in 2005.
The Ubuntu Linux distribution considered using launchd in 2006. However, launchd was rejected as an option because it was released under the Apple Public Source License – which at the time was described as an "inescapable licence problem".
In August 2006, Apple relicensed launchd under the Apache License, Version 2.0 in an effort to make adoption by other open source developers easier.
Read more about this topic: Launchd