appilixNotifications is a Ruby gem that simplifies sending push notifications to users of your application via the appilix API. It includes functionality to fetch registered users and send notifications with customizable titles, bodies, and optional user-specific or link-specific parameters.

Uses Houston (https://github.com/nomad/houston/) to send push notifications to iOS devices.

Sinatra-based server to deliver Apple Push Notifications

ZeroPush is a simple service for sending iOS push notifications. (http://zeropush.com)

Easily construct JSON payloads for Apple's push notification service.

This provides a common interface for a simple push notification using ifttt.com. You will have to sign up there and get a key.

Many apps need to send basic notifications to users, often using multiple delivery methods (like email, push notifications, SMS, twitter, etc). This gem is designed to make that process easy and track the state of the notification in a centralized fashion.

ApplePush is a very simple implementation of the APNS (Apple Push Notification Service) protocol. It differs from the APNS gem by being able to push to different iOS apps from the same Ruby application.

Easy to use library for Apple's Push Notification Service with Rails 3

APND (Apple Push Notification Daemon) is a ruby library to send Apple Push Notifications to iPhones.

Builds push packages for OS X Mavericks web notifications

ZeroPushWoosh is a simple service for sending iOS push notifications. (http://zeropush.com)

ActionPush is a lightweight tool which allows you to organize Push notifications the same way Action Mailer does. It includes built-in support for the GORUSH gateway

A gem for Ruby on Rails that makes managing devices and push notifications for both iOS and Android easy and reliable.

A ruby script that displays your current tarsnap ballance in picoUSD. The script can send notifications when the account balance falls below the predefined threshold. Argosnap supports email, pushover and OSX notifications.

Deliver your notifications to various services.

Parse Server Ruby Client. Perform Object-relational mapping between Parse Server and Ruby classes, with authentication, cloud code webhooks, push notifications and more built in.

Android Push Notification in Ruby: simple, fast, high-quality client for FCM (Firebase Cloud Messaging)

A Ruby client for the HTTP/2 version of the Apple Push Notification Service.

red-socket.com is a service providing push notifications to clients listening to websockets. Gem is a wrapper for the service to allow pushing messages.