Finding Guitar Tuner?

Hi everyone..are you guys having a headache and have a hard feeling to taking a money out of your pocket to buy a guitar tuner from shop which cost you around RM50-100? Why waste those money?if got those money why don't you do something more benefit to yourself and others..like donating and help others??
I not sure either is this software is better than the original guitar turning devices which sell at the shop but i sure that it could at least used to maintain your guitar pitch voice if it is turned away from the pitch you want..but to use this devices your computer need to have at least an internal or external microphone connected to your computer as it take your guitar voice from the microphone and analyze in this software
you can try to download these software from the websites link shown as below:

http://www.nch.com.au/tuner/index.html

This link does not contain any viruses..don't worry..whatever i never try this software before..my friends does..you guys may found it out after installing and try it..hope it will help..
have a nice days^^