Lingon
1.2 is open source.
Lingon
2.2.1 is in some ways more capable than 3.x. App Store screenshots show the five areas in which it can work with agents and daemons.
Lingon 3
3.1.2; 3 or greater is recommended if you use OS X Lion 10.7 or later.
I purchased both versions 2 and 3, and use 1.2 without difficulty on Mountain Lion.
1.2 is without the disorder bug that affects representation of agent and daemon .plist files stored on file systems such as ZFS. Screenshots of 1.2 on OS X 10.8.2, with a daemon that's discussed under Automated zpool check and scrub: http://www.wuala.com/grahamperrin/publi ... de=gallery
Blogged by the developer: sometimes it matters — Smultron 3 and Lingon 2 available again.