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Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
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.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Tunnelblick - free software for OpenVPN on OS X and macOS
Postman - The Collaboration Platform for API Development
Viscosity - Viscosity is a VPN client for Mac OS X and Windows.