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Fiddler - Fiddler is a debugging program for websites.
Sublime Web Inspector - Sublime Web Inspector enables users to debug Javascript right in the Sublime Text editor.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Xpediter - Xpediter is a mainframe application interactive debugging tool. It also offers code coverage for mainframe application analysis.
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.
UNICOM PurifyPlus - PurifyPlus is a run-time analysis tools for application reliability and performance.