Pusher Beams - Send push notifications programmatically at scale
Now Push Notify - iOS does not support browser notifications today, but Now Push Notify makes this possible.
F5Bot - F5Bot will send you an email whenever your brand, product, or keyword is mentioned online.
Push Notification Preview - A simple tool for previewing push notification copy
PushNinja - by 500apps
mention - Media monitoring made easy with Mention. Create alerts on your name, brand, competitors and be informed in real-time of any mention on the web and social networks