Microsoft
Yes, both Kaa and Azure IoT Central offer a Free Trial.
Kaa is designed for Large Enterprises, Medium Business and Small Business.
Azure IoT Central is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Kaa Starts at $99/Month whereas for Azure IoT Central Starts at $0.08/Month.
Some top alternatives to Kaa includes Wia, Qualified, Workvivo, BigDataCloud, Kaleidoscope IoT, Gaonic, CloudPlugs, Azure IoT Solution Accelerators, Kii, Azure IoT Central and IBM Watson IoT Platform.
Some top alternatives to Azure IoT Central includes Telit IoT Platforms, IoTWorX, Coiote IoT Device Management, CloudPlugs, Azure IoT Solution Accelerators, Azure IoT Hub, IBM Watson IoT Platform, AWS IoT Device Management and Friendly One-IoT Device Management.