Versatile multimedia tool, Adobe Animate offers 4K video export, HTML5 support, creative illustration tools, colored onion skinning, and seamless Creative Cloud integration. Formerly Flash Professional, it includes a rotatable canvas and vector brushes.

FlashDevelop is a free and open source (MIT license) code editor for Actionscript (2 and 3), Flex (MXML) and HaXe.

Visual tool for creating interactive SVG animations: HTML5 banners, svg icons, interactive web infographics etc.

MiniBuilder is a very lightweight Flash builder, created for developing programs written in ActionScript 3. It's written in ActionScript itself.

Artist Code is an intuitive software for creating animation ( Movie, Animated Gif, Images) only by coding, it allows you to add image, text and pixels and place them with simple script offering you a fun and unlimited way to create whatever you want.

AXDT is a plugin for Eclipse IDE that makes it possible to write MXML and AS3 with code support.

FDT is a powerful Flash/Flex development environment for ActionScript, MXML and haXe. FDT enhances your workflow while increasing your productivity.

Express Animate is free animation software that gives you the ability to animate shapes, text and imported images. You are also able to enhance your movie projects in post-production using key-frame motion animation, masking, dummy objects and more.