httpbin(1) - HTTP request and response service
Pushbullet for Mac - Send your iOS notifications to your Mac
HTTPDump - A simple, beautiful Webhook debugging tool.
Muzzle - Silence embarrassing notifications while screensharing
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
CleanSpark - Declutter your screen to share it on your next presentation