Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
UI Faces - Avatars for design mockups
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.
Nucleus UI - Free UI component library to create mockups in Figma quickly
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
lstore.graphic - Mockup Scene Creator