Redsn0w 0.9.15b3 Download can be found on the iPhone Dev-Team’s blog, but the restrictions are that it can jailbreak only A4 chip iDevices tetheredly.
iPhone 4S Jailbreak can be achieved for the following iOS versions, 6, 6.0.1, 6.1, 6.1.1 and 6.1.2 versions. All the previous iOS versions are supported too
Great news for all the users that have iOS 6.x.x to their iDevices, because with a Redsn0w 0.9.15b3 Download you will be able to jailbreak your device even if you have the latest iOS version, 6.1.3 iOS.
If you want to perform an iPhone 5 Jailbreak and your device has the 6.1 iOS version then the news are very good for you. Some of the iPhone Dev-Team members created a new team, the evad3rs, and their new tool can achieve an untethered iPhone 5 Jailbreak
Redsn0w 0.9.10b5 version and Absinthe can jailbreak 5.0.1 iOS version, and Absinthe is able to jailbreak your device a little quicker too, but Redsn0w 0.9.10b5 version is not only for jailbreaking purposes.