FlashDevelop just keeps getting better... :)

What’s new:

• General fixes (code completion, search, find & replace)
• Now with caching: much faster startup and projects opening
• Code completion & code generation for method override’s
• Updated project templates with completion for CS3 fl classes, Flex mx classes and AIR classes
• FD now fully works as a standalone application (ie. on your USB key)
• Updated Start Page now notifies of program updates
• New extensible “intrinsic” completion support
• New AIR projects

Read more: http://www.flashdevelop.org/community/viewtopic.php?t=2273