Partyhero - Pass your friends the aux!
Webhook.site - Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.
Join My Playlist - Listen to music live together with your friends in Spotify.
Hookdeck - Hookdeck makes it simple to build and deploy reliable, testable, and debuggable applications that rely on webhooks.
OutLoud Social Jukebox - Control the music with your friends in real-time
Svix - The enterprise ready webhooks service, open-source and in the cloud.