Pusher Beams - Send push notifications programmatically at scale
Syften - Better social media keyword alerts
Push Notification Preview - A simple tool for previewing push notification copy
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
Ultimate Push Notifications by Ecomfit - Retarget customers and protect abandoned cart to boost sale
Google Alerts - Google Alerts will send you email or RSS updates of the latest relevant Google results (web, news...