List of free real-time tool/service for developer👇🏽
Pusher
Simple, scalable and reliable. Hosted realtime APIs loved by developers and trusted by giants. Build live dashboards, notifications, geotracking, chat and more.
Tag: real-time
Sandbox Account 200k messages/day 100 Concurrent connections

Firebase
Firebase helps you build and run successful apps Backed by Google and loved by app development teams - from startups to global enterprises
Tag: database, hosting, hosting-dynamic, hosting-static, storage, authentication, real-time
Authentication 10k/month Cloud Firestore (stored data: 1 GiB total) Realtime Database (stored data: 1 GB) Hosting storage 10 GB Cloud storage 5 GB

Supabase
The Open Source Firebase Alternative Create a backend in less than 2 minutes. Start your project with a Postgres Database, Authentication, instant APIs, realtime subscriptions and Storage.
Tag: database, storage, authentication, real-time
Get free database, authentication and storage Unlimited API request Database space (Up to 500MB) Users 10.000 users Social Auth provider Storage Up to 1GB Transfer Limit Up to 2GB Team members: unlimited

Socket.IO
Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.
Tag: real-time

Liveblocks
Liveblocks is a set of APIs and tools that helps you create performant and reliable collaborative experiences.
Tag: real-time, collaboration
Unlimited rooms 30 simultaneous connections 5 simultaneous connections per room Community support

Pusher Beams
A push notifications API for developers who need critical information delivered every time. Scalable delivery for all your apps with no complex integration.
Tag: real-time, push-notification
Sandbox Account 1,000 subscribers