The Arduino team have created a new tutorial on how to migrate all your code from the desktop application to the new Arduino IDE Web Editor, check it out here.

The Arduino Web Editor has got some exciting new features! First of all, you just need to have Arduino account to use it. We completely removed the invite system, making it accessible to everyone.

Arduino microcontrollers have added Python to the range of compatible programming languages. Others can be used, and not just Arduino's own IDE app.