FlashDevelop
Open SourceFlashDevelop is a powerful and highly-extendable Integrated Development Environment (IDE) purpose-built for Flash and ActionScript development. It offers robust features for building websites, web applications, desktop applications, and video games, with strong support for ActionScript 3 and Haxe projects.
Key Features
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Highly performant and lightweight.
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Excellent support for ActionScript 3 and Haxe.
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Robust code completion and refactoring tools.