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HTTP Status Dogs - Hypertext Transfer Protocol Response status codes, and dogs
Fiddler - Fiddler is a debugging program for websites.
HTTP Status Tester - Test URLs in bulk for their HTTP responses, by ex-Google
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
HTTP Status Cats - Cats for every HTTP status code, by ex-Google.
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.