Webhooks by Zapier - Move Your Data Instantly With Webhooks
API List - A collective list of APIs. Build something.
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.
Abstract APIs - Simple, powerful APIs for everyday dev tasks
Hookdeck - Hookdeck makes it simple to build and deploy reliable, testable, and debuggable applications that rely on webhooks.
Mocklets - A HTTP-based API simulator to assist parallel development 🛠️