iStat Server for Mac transmits your computer or server’s vital statistics to iStat for iOS.
It is the fastest and easiest way to remotely monitor a Mac from anywhere in the world, using your iPhone or iPad.
Version: 2.12 (version history). 64-bit Mac and OS X 10.6 or newer required.
iStat Server 1.01 is still available, if you have an older Mac.