Wireshark : Wireshark is the world's foremost network protocol analyzer. It lets you see what's happening on your network at a microscopic level. It is the de fac...
Buildbot : Buildbot is an open-source framework for automating software build, test, and release processes.
Webhook Tester : Webhook Tester allows you to easily test webhooks and other types of HTTP requests.
httpbin.org : A simple HTTP Request & Response Service.
An HTTP Viewer and HTTP Sniffer for IE and Firefox
