greenpois0n - Greenpois0n performs an untethered jailbreak for iOS 4.
iToolab FixGo - When your iOS device gets stuck on the white/black screen, Apple Logo, Recovery/DFU Mode, restart loop, is bricked, as a frozen screen or simply won’t start, iToolab FixGo is the ideal solution for you.
3uTools - 3uTools is a most efficient iOS file and data management tool for Apple users.
AnyFix - AnyFix is a tool that provides a solution for almost any iOS issue you may come across, from your device crashing or not syncing accounts to having trouble with your connection or speaker/headphone jack.
Blackra1n - (This is an OUTDATED jailbreaking method.)
iMyfone iOS System Recovery - Totally Repair Your iOS System without Data Loss