"Pusher is a simple hosted API for quickly, easily and securely integrating realtime bi-directional functionality via WebSockets to web and mobile apps, or any other Internet connected device."
"Hipache (pronounce hɪ'pætʃɪ) is a distributed proxy designed to route high volumes of http and websocket traffic to unusually large numbers of virtual hosts, in a highly dynamic topology where backends are added and removed several times per second. It is particularly well-suited for PaaS (platform-as-a-service) and other environments that are both business-critical and multi-tenant."