Here a few popular IoT cloud services and applications:
- Arduino IoT (beta): https://create.arduino.cc/iot/
- SparkFun Data: https://data.sparkfun.com/
- 100% free service
- Data ‘streams’ are public, but can be hidden as long as URL is not given out publicly.
- Limited to 50MB of data and a write interval of 15-seconds minimum.
- ThingSpeak: https://thingspeak.com/
- Analog IO: http://analog.io
Popular IoT Devices:
- Particle Electron
- Used for creating 3G cellular-connected electronics projects and products.
- Operates at 900/1800MHz and does not support CDMA