Open Source Proxy Software
Found 10 self-hosted alternatives in this category.
g3proxy
Forward proxy server supporting proxy chaining, protocol inspection, MITM Interception, ICAP adaptation and transparent proxy
imgproxy
Fast and secure standalone server for resizing and converting remote images
iodine
IPv4 over DNS tunnel solution, enabling you to start up a socks5 proxy listener
Outline Server
A proxy server that runs a Shadowsocks instance for each access key and a REST API to manage the access keys
Privoxy
Non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data and HTTP headers, controlling access, and removing ads and other obnoxious Internet junk
sish
HTTP(S)/WS(S)/TCP tunnels to localhost using only SSH (serveo/ngrok alternative)
socks5-proxy-server
SOCKS5 proxy server with built-in authentication and Telegram-bot for user management and user statistics on data spent (handy when you pay per GB of data). It is dockerised and simple to install
Squid
Caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages