Finding (older?) applications for an iPod Touch 4G device (IOS 6.1.6)
I did a search in the App Store using the search criteria "iOS 6" and a bunch of apps came up. I checked a few, and the ones I checked all said they were compatible with iOS 6.0 and later. If there is a certain type of app you're looking for, I would imagine using the search criteria "iOS 6 music," for example, may bring up music apps compatible with iOS 6.0.