Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Proxifier - Proxifier extends the advantages of a proxy server to network applications that don't natively support it.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
redsocks - Redsocks is a daemon running on the local system, that will transparently tunnel any TCP connection...
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
Proxycap - ProxyCap empowers you to divert your PC’s system associations through intermediary servers.