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.

Facebook for Business - Facebook Business gives the latest news, advertising tips, best practices and case studies to meet the business goals.

PushBots - Light SDK for mobile push notifications

SocialPilot - SocialPilot is an app designed to help businesses and professionals with social media marketing.

ZoPush - Personalized Browser Push Notifications for Web and Mobile.

Buzzstream - Build Relationships. Build Buzz. Web-based software that helps the world’s best marketers promote their products, services and content.