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.
Mailshake - Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.
ZoPush - Personalized Browser Push Notifications for Web and Mobile.
iZooto - Engage your mobile and desktop web users with intelligent web push notifications.
Cold Email Hacks - Proven cold email templates and tactics for B2B startups
Roost - Web Push has 30x better opt-in than email. Increase engagement with your audience using web push notifications