B4R - Development tool for native Arduino programs.
Visual Micro - Arduino IDE for Visual Studio and Atmel Studio
Circuito.io - Instant code and wiring for your project
Visuino - Visuino is a visual programming environment that lets you write programs from Arduino circuit boards.
embedXcode - embedXcode is a template for Xcode.
ArduBlock - ArduBlock is a graphical programming language plugin specifically made for Arduino circuits and controllers.