AVR development board IDE from Arduino CC

 Arduino is an open-source electronics prototyping platform based on
 flexible, easy-to-use hardware and software. It's intended for artists,
 designers, hobbyists, and anyone interested in creating interactive
 objects or environments.
 .
 This package will install the integrated development environment that
 allows for program writing, code verification, compiling, and uploading
 to the Arduino development board. Example code will also be installed.
 .
 Some base AVR libraries will be provided by the depending additional
 package arduino-core-avr. More libraries can be installed within the IDE
 itself by calling the libarary manager. This requires a working internet
 access.