What is Flash Builder?
Adobe Flash Builder 4 is a professional-grade Eclipse based development tool that enables intelligent coding, interactive step-through debugging, and visual design of the user interface layout, appearance, and behavior of rich Internet applications (RIAs). You can import assets from Adobe Creative Suite® software or entire projects from Adobe Flash Catalyst™ software into Flash Builder 4, making it easy for designers and developers to work together. Flash Builder is licensed on a per-seat developer basis and is available starting at US$249. You can download a 60-day free trial of Flash Builder to get started.