Proxyman is described as 'A modern and intuitive HTTP debugging proxy' and is an app in the Development category. There are more than 100 alternatives to Proxyman for a variety of platforms, including Windows, Mac, Android, iPhone and Linux. The best alternative is Tor, which is both free and Open Source. Other great apps like Proxyman are Wireshark (Free, Open Source), ProtonVPN (Freemium, Open Source), Mullvad (Paid, Open Source) and ZeroTier (Freemium).
Tor is free software and an open network that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security.
Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de facto (and often de jure) standard across many industries and educational institutions.
Mullvad is an ethical VPN provider based in Gothenburg, Sweden. They keep no logs and an account number is the only thing you need to connect to Mullvad VPN. They ask for no email, no phone number; no personal information whatsoever.
Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data.
GNUnet is a framework for secure peer-to-peer networking that does not use any centralized or otherwise trusted services. A first service implemented on top of the networking layer allows anonymous censorship-resistant file-sharing.
A secure socks5 proxy, designed to protect your Internet traffic. - Super Fast Bleeding edge techniques using Asynchronous I/O and Event-driven programming. - Flexible Encryption Secured with industry level encryption algorithm. Flexible to support custom algorithms.