KingRoot
KingRoot is an application that lets you root your Android device in a matter of seconds, as long as you have an operating system between Android 4.2.2 and Android 5.1. This means that this app lets you do the same thing as the classic Towelroot, but you can use it even if you have Lollipop.
The procedure to root your device is as simple as Towelroot. Even if the app is entirely in Chinese, the only thing you have to do is press on the blue button and wait. After a couple of seconds, the application finishes working and you'll have your rooted device.
It's important to know that KingRoot doesn't work with all type devices. On Moto G, for instance, it usually has some trouble. With Nexus, though, it usually works perfectly.
KingRoot is an excellent way to root your Android device. That said, rooting a device is always a delicate process, so do it with care and be conscious of the risks involved.