KingRoot/SuperSU

"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."

http://kingroot.en.uptodown.com/android

https://kingroot.net/root-installation-via-android-apk/

https://github.com/meefik/linuxdeploy

http://hackaday.com/2017/03/22/an-android-phone-makes-a-better-server-than-youd-think/

WARNING!  WARNING! WARNING!

"KingRoot is a chinese app, and really smells fishy. I have tried it for my older phone (which was made by a local brand in Turkey). Although the phone was quite new to market that time, the app achieved the root. But installed tons of different chinese app.

To overcome this situation, there is also an app “SuperSU-Me” (i believe i found on xda-devs) which deletes all the kingroot apps and installs known SuperSU instead. I have used that phone nearly 2 years and never had a problem.
...
 It is fishy. The best way to use it is get root, then use root to remove KingRoot and install SuperSU.
...
There’s an app called GnuRootDebian on the play store that is a regular non root (and not rooting) app that install apt (with regular debian jessie armhf repos), coreutils and the rest.
...
I use termux, which is great in that it has the ability to access many android API functions such as camera shots and battery levels.
...
LineageOS(forked cyanogen) works great, just go to the f-Droid website and install their ‘store’ .apk and you have a great FOSS only software repository regularly updated. I grab the remaining non-free apps I have to have using apk-dl ."

http://hackaday.com/2017/03/22/an-android-phone-makes-a-better-server-than-youd-think/#comments