1.Lightstreamer.com
Lightstreamer is a top-performing real-time messaging server optimized for the Internet. Blending WebSockets, HTTP, and push notifications, it streams data to/from mobile, tablet, browser-based, desktop, and IoT applications. Chosen by organizations ranging from startups to Fortune 500 companies, Lightstreamer satisfies the key requirements of mission-critical systems, such as high scalability, low bandwidth consumption, smart firewall traversal, and adaptive throttling. Its total reliability is demonstrated by a rock-solid track record.