Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Mixed in Key - Mixed In Key is award-winning DJ software that gives you the #1 technique of the world's best...
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
beaTunes - Smart software for library management, music analysis, and playlist creation. For Windows and macOS.
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.
Tunebat - A browser based song key and bpm database. Supplies compatible songs for harmonic mixing.