Demetrius Tautu

This plugin allows your visitors to subscribe to your push notifications as well as receive push notifications whenever you publish a new post.
The process of subscription is 100% automated and your subscribers will be saved within your DigitalPUSH account.
The process of sending notifications on a new post is also 100% automated and it will notify all your previously subscribed users with the following information: 
* Post title ( up to 64 characters ) 
* Post content without any HTML tags ( up to 128 characters ) 
* Post permalink 
* Post featured image ( If the post has no featured image, a standard bell image will be used instead. The same applies if your featured image is http:// instead of https:// )
The subscription is made by implementing the DigitalPUSH javascript library into your pages ( https://cdn.digitalpush.org/lib.js ), library which handles the entire process. 
The push notification sending process is handled by making a POST call from the plugin to the DigitalPUSH API ( https://api.digitalpush.org/push/ ).
To make use of the plugin you will need an account with DigitalPUSH which can be created here: https://digitalpush.org/register.php 
The registration is instant and completely free.
DigitalPUSH is a free to use push notifications service which can be found here: https://digitalpush.org 
DigitalPUSH terms of service: https://digitalpush.org/tos.php 
DigitalPUSH privacy policy: https://digitalpush.org/privacy.php

DigitalPUSH notifications

This plugin allows you to to implement push notifications with your WordPress blog.

Ciao121

Pushforge.com is an extremely easy web push service enabling web sitest owners to send push notifications to their site’s users. This plugin adds a checkbox on your posts editing page to push the post when you publish/updates it.
Signing up you can send messages to your users via a Control Panel or using the provided API. Also you get a customizable subscribing page and customizable subscribe button. You can choose to use it or you can simply use the provided subscribing link as you like.
You can target you users by group or in the way you prefer.
No SSL is reqiured. Pushforges provides a free SSL certified subdomain for each user.

Pushforge web push

2 minutes integration of Pushforge.com web push notification in your Wordpress site.

DigitalPUSH notifications vs Pushforge web push