Visuino - Visuino is a visual programming environment that lets you write programs from Arduino circuit boards.
codebender - The Largest Arduino Playground In The World. Create, share and run your code anywhere.
ArduBlock - ArduBlock is a graphical programming language plugin specifically made for Arduino circuits and controllers.
Raspberry Pi - The Raspberry Pi is a tiny and affordable computer that you can use to learn programming through fun, practical projects. Join the global Raspberry Pi community.
MINIBLOQ - miniBloq is an open source graphical programming environment for Multiplo™, Arduino™, physical computing devices and robots.
Arduino - Build your own electronics