List of free push-notification stuff for developerππ½
If you're looking for all programming tools around push-notification (not just free). Check this page List of push-notification Programming Tools
Knock
Knock is flexible, reliable notifications infrastructure that's built to scale with you.
Tag: real-time, push-notification
10,000 Free notifications per month Unlimited team members Unlimited notification workflows Preferences support Batch and delay functions

Push by Techulus
Receive custom push notifications without building your own app!
Tag: push-notification
Send 100 notifications/month Connect up to 5 devices Email 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