Software user

This tutorial from wikiHow will show you how to take full control of your arduino by showing you how to take the C++ code arduino provides you, and use (or modify) this code to create your own C++ programs for the arduino platforms, using the Eclipse C++ IDE, the AVR-GCC compiler, and AVRdude to download your programs to hardware

Eclipse is a free, powerful, and full-featured development environment that can be set up to work with AVR and Arduino. This page explains how to setup Eclipse with WinAVR and the Eclipse plugin AVR-eclipse. The playground is a publicly-editable wiki about Arduino.