Adobe Flash Builder offers built-in code editors for MXML and ActionScript and a WYSIWYG editor for modifying MXML applications. Developed by Adobe
License: Commercial
FlashDevelop is a lightweight, open-source IDE that focuses on speed and customization, making it ideal for developers who prefer a free tool with flexibility. On the other hand, Adobe Flash Builder offers a comprehensive set of features and robust support for professional development, but comes at a higher cost and is more resource-intensive.