Realtime server using Lightstreamer https://lightstreamer.com
Lightstreamer is a stand-alone server, fully optimized for real-time data delivery. With a rich set of client libs, it can reach any kind of client application, be it browser-based, mobile, or desktop. Lightstreamer can traverse any proxy and firewall, with bi-directional data streaming. It provides pub/sub APIs for any type of messaging pattern (broadcasting, multicasting, unicasting). And it is the only solution to offer adaptive throttling and bandwidth management, with dynamic data filtering.