ThingSpeak - Open source data platform for the Internet of Things. ThingSpeak Features
The IoT Guru - the IoT cloud backend company
dweet.io - Ridiculously simple data sharing for the Internet of Things.
Xively - Xively offers an Internet of Things product relationship management solution for enterprises.
WiscNet - WiscNet Security Services provide a managed firewall and understands the importance of network security.
AskSensors - The easiest IoT platform