PubNub

PubNub offers realtime infrastructure-as-a-service, and provides enterprise-grade security, 99.999% SLA-backed reliability, and global scalability to support the largest realtime deployments, all via simple APIs and 70+ SDKs. Additionally, developers can take advantage of value added features for application areas like chat, collaboration, IoT device control, and realtime updates to further accelerate build and release times.