Ok let me start this off by saying that i currently use the "Cher" effect on some of my songs.
Auto-Tune bashers around the world do not understand the possibilites of that software. you can literally be the worse singer on the face of this earth...yet Auto-Tune is there to fix it for you!
Auto-Tune costs money and most people find ways to "crack" the software, but if you dont want to go through that hassle just go to GSnap
GSnap is an Auto-Tune alternative and it works pretty well. it doesn't provide that "smooth, robotic" sound that Auto-Tune does BUT it corrects your pitch and makes it somewhat "auto-tuned." I'm pretty sure you can tweak the sounds of GSnap to bring you the correct sound of the desired Auto-Tune effect. this is an excellent substitute (even though there are better) but if you dont want to download software, copy and paste serial numbers, or have a specified program to host it....than get GSnap!
You can also download different versions of GSnap, one with the original GSnap skin and then the other one with the "GrymmJack" skin. the second one looks more smoother and stylish than the original one.
GSnap is one of the few vst's you can download from the website and combining all these effects can make your songs sound powerful and even....snappy