Angry IP scanner is fast and friendly network scanner for Windows, Linux, and Mac. It is very extensible, allowing it to be used for very wide range of purposes, with the primary goal of being useful to network administrators.
Interesting alternative but Nmap is more thorough and accurate in testing.
So disappointed that I have to be vigilant against crap-ware bundling. The program is fine as long as you don't need too much but I will not install it again as long as it is bundled with crap I don't need or want.