iFaith is described as 'program that can save the SHSH blobs of the current version of iOS that's running on your jailbroken iPhone. It will work any version of iOS, whether or not that version is still signed by Apple' and is an app in the System & Hardware category. There are three alternatives to iFaith for iPad, iPhone, Linux, Mac and Windows. The best alternative is TinyUmbrella, which is both free and Open Source. Other great apps like iFaith are PkgBackup (Paid) and iSHSHit (Free).
TinyUmbrella saves the "SHSH blobs" of your Apple device (i.e. iPhone, iPod, or iPad), allowing you to bypass Apple's servers and downgrade your firmware through iTunes, whenever you want. Your device does NOT have to be jailbroken for TinyUmbrella to work.