The AWS IoT Platform is an enterprise level platform that can support billions of devices and trillions of messages.
PlatformIO comes with its own cross-platform IDE and unified debugger as well as remote unit testing and firmware updates.
Intel's IoT model delivers trusted data to the Cloud, and ongoing value through analytics.
Azure IoT Suite packages together multiple Azure services with custom extensions as preconfigured solutions.
ThingWorx is a platform for the rapid development and deployment of smart, connected devices.
Check out some of the top IoT Platforms and Tools worth reviewing if you plan to move into IoT development.