iOS 11.3.1 Jailbreak No Computer! iOS 11.3.1 – 11.2 & Up To iPhone X Supported. + 25 Amazing Tweaks To Install After Jailbreak!
No Computer JB: https://ignition.fun/
Electra DL: https://coolstar.org/electra/
Cydia Impactor: http://www.cydiaimpactor.com/ .