Open-source proxies

6 proxies whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

1. Privoxy Grade B

   Non-caching web proxy that filters web pages and HTTP headers to remove ads and trackers, with configurable access control and support for chaining to Tor.

   GPL-2.0 or later. Source code

2. sing-box Grade B

   Universal proxy platform that supports Shadowsocks, VLESS, Trojan, Hysteria 2, WireGuard and other protocols with rule-based routing, available as a command-line core and official graphical clients.

   GPL-3.0-or-later, with an added restriction on use of the project name. Source code

3. V2Ray Grade B

   Proxy platform maintained by the V2Fly community that supports VMess, VLESS, Shadowsocks, Trojan and other protocols with configurable routing, used as a server and client core for censorship circumvention.

   MIT. Source code

4. Xray Grade B

   Proxy core forked from V2Ray by Project X, adding the XTLS, VLESS and REALITY transports for censorship circumvention; runs as a server or client and powers many third-party apps.

   MPL-2.0. Source code

5. Outline Grade C

   Tool for setting up a personal Shadowsocks-based VPN server on a cloud provider and sharing access keys, with a manager app for servers and client apps for users.

   Apache-2.0 for the apps and the server. Source code

6. Shadowsocks Grade D

   Encrypted SOCKS5-based proxy protocol designed to bypass internet censorship, with open-source server and client implementations for desktop and mobile platforms.

   MIT. Source code

Compare all 8 proxies, open source or not.