API List - A collective list of APIs. Build something.
Webhooks by Zapier - Move Your Data Instantly With Webhooks
Abstract APIs - Simple, powerful APIs for everyday dev tasks
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.
Phantombuster - A marketplace of simple to use no-code APIs
Hookdeck - Hookdeck makes it simple to build and deploy reliable, testable, and debuggable applications that rely on webhooks.