OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Pusher Beams - Send push notifications programmatically at scale
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
Pusher - Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
PushOwl - Re-engage website visitors with push notifications
Polyvore - Polyvore is a free to use Shopping application that makes it fun and easy to style outfits, shop for clothes you love, buy the best deals and discover new fashion and trend.