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Pusher Beams - Send push notifications programmatically at scale
ReqRes - A hosted REST-API ready to respond to your AJAX requests.
PushOwl - Re-engage website visitors with push notifications
JsonAPI - Application and Data, Languages & Frameworks, and Query Languages
Pusher - Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
JSON Server - Get a full fake REST API with zero coding in less than 30 seconds. For front-end developers who need a quick back-end for prototyping and mocking