Web page debugging Apps
Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet.
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet.
HTTP Debugger Pro - A Professional HTTP Sniffer and Analyzer for Developers
BugBattle is the most affordable and fun in-app bug reporting tool for apps & web apps! With BugBattle we put the annoying task of bug fixing upside down and turned it into a fun experience for your whole team.
Monitor and reproduce errors in web sites/applications. Using the built-in recorder feature you’ll know exactly what the user did. This means you don’t have to read call stacks or parse through huge logs to be able to reproduce bugs.
Working quietly on the Menubar, Surge is a high-performance HTTP/SOCKS5 proxy server.
Not sure if 'discontinued' is quite right, but James has now officially moved in 'maintenance mode', with little or no ongoing development or support. See the readme: https://github.com/james-proxy/james#this-project-is-in-maintenance-mode .
It would be helpful to highlight that here imo.
James is a HTTP Proxy and Monitor that enables developers to view and intercept requests made from the browser. It is an open-source alternative to the popular developer tool Charles.
Chrome Logger is a Google Chrome extension for debugging server side applications in the Chrome console.
Omnibug is a plugin for the Google Chrome and Mozilla Firefox browsers to ease developing and debugging web metrics implementations.
Gear is a powerful web browser lets you enjoy the simple, fast, secure, well-designed and exclusive browsing experience.