jmartin82/mmock: Mmock is an HTTP mocking application for testing and fast prototyping
trimstray/htrace.sh: My simple Swiss Army knife for http/https troubleshooting and profiling.
ngrok - secure introspectable tunnels to localhost
jkbr/httpie · GitHub
mitmproxy - home
htty, the HTTP TTY
nodejitsu's node-http-proxy at master - GitHub