Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Proxy SwitchyOmega - Proxy SwitchyOmega is the updated version of the proxy settings for easily switching and managing the multiple proxy servers and files within minutes.
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.
FoxyProxy - FoxyProxy is a set of proxy and proxy switcher to reach the content of international market and easily switch between multiple proxies and proxy servers.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
Proxifier - Proxifier extends the advantages of a proxy server to network applications that don't natively support it.