Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
LabsLand - LabsLand lets students access real educational laboratories through the Internet.
B4R - Development tool for native Arduino programs.
PhET Interactive Simulations - Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.
PlatformIO - Next-generation IDE for IoT
myPhysicsLab - myPhysicsLab provides JavaScript classes to build real-time interactive animated physics...