This is the end of a century. People in China had used 4 kinds of tools to skip the GFW: freegate, openvpn, goagnet, shadowsocks.
freegate is a traditional http proxy or socks proxy built by Falun Gong (https://en.wikipedia.org/wiki/Falun_Gong). They built lots of software with the same technology: freegate gpass freeu dynapass... People share this kind of banned software sending to each others just like teenagers share adult videos. After update of GFW, it become un-available and un-usable.
openvpn turns break GFW as a business, people sells openvpn account at $1.66 a month regularly. They sell this kind of services package including pptp l2tp ssh openvpn to those who need a free network.
goagent is a free software written by Phus Lu. It use Google's application engine as server so you can use it without paying money.So it replaced openvpn since it cost $0. After China banned Google, this way become more and more hard.
shadowsock is a protocol designed by clowwindy. It become a environment. People use python, C, nodejs, golang, rust, obj-c, java to write their own client and server. Some organization share their server for free, some people sell account and provide high speed. shadowvpn works as a VPN while shadowsocks works as a socks5 proxy, but share the same technology.
This is the end of shadowsocks. I means recently more and more evidence shows that GFW has finally find a way to recognize shadowsocks's packets. Then they stopped the development of shadowsocks.
That's all. The winter of China's network comes.