Authpush is an easy, code-less way to send push notifications to your users.
We also have an API at https://github.com/authbaseco/authpush-api.
Also made by a 15y/o.
Push More is a Telegram bot that shows any webhook requests that are sent to it. It's a simple tool for developers for get notified of anything in they like in their messenger app of choice, Telegram.