The Arduino IDE supports multiple files by adding more tabs. If you use INO files you’re only adding one at a time, but if you use C/C++ header and source files it’s two at time.

WifiDuino has been designed to offer users an open-source Arduino-compatible, wifi-enabled board. Enabling makers and developers to use Arduino IDE (Integrated Development Environment) interface ...

Developers, makers and hobbyists that enjoy using the Arduino platform and the latest release of the Arduino IDE, will be pleased to know that the IDE releases have now changed from nightly builds ...