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PlatformIO - Next-generation IDE for IoT
Circuito.io - Instant code and wiring for your project
Visual Micro - Arduino IDE for Visual Studio and Atmel Studio
B4R - Development tool for native Arduino programs.
Eclipse IoT - Eclipse IoT provides the technology needed to build IoT Devices, Gateways, and Cloud Platforms.
embedXcode - embedXcode is a template for Xcode.