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CCProxy - Want to share Internet connection? Get every computer online through a single Internet connection?
Firezone - Firezone is a remote access platform that’s painless to deploy, easy to manage, and built on WireGuard® to be blazing fast. Best of all it's self-hosted and open-source.
Apache Traffic Server - Fast, scalable and extensible HTTP/S 2 and 1.1 compliant caching proxy server.
Tunnelblick - free software for OpenVPN on OS X and macOS
3proxy - 3proxy freeware proxy server for Windows and Unix. HTTP, SOCKS, FTP, POP3
Viscosity - Viscosity is a VPN client for Mac OS X and Windows.