Android doesn't come with system wide socks proxy support, and i couldn't find an open source app for it either. Is anyone aware of one?
Nonetheless this is a surprisingly simple and bullet proof solution: SSH, that's not vpn boss, i need it for work.
Outline is an open source shadowsocks client, and you provision your own server to act as the proxy. You can use it against any Shadowsocks server you want, and the protocol makes it look like regular https traffic.
https://github.com/Jigsaw-Code/outline-apps
Android & iOS & Linux & Mac & Windows
their server installer will help set up a proxy for users that aren't familiar with shadowsocks, too
For web browsing, Firefox lets you configure socks on android.