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Flash Builder 4 (formerly Flex Builder)

Some developers create Flex applications using the free SDK alone, but they can build faster with fewer errors if they build with the new Flash  Builder 4 (formerly Flex Builder), which supplies intelligent coding, interactive step-by-step debugging, and visual design of the user interface layout.

Build rich Adobe AIR runtime applications for the desktop using Flex and Flash Builder 4.

Import design assets created using Adobe Flash Professional, Illustrator®, Photoshop®, or Fireworks® software, or import a complete application user interface created using Flash Catalyst.

A new workflow between Flash Professional and Flash Builder facilitates importing and updating custom Flex components. Designers using Flash Catalyst and programmers using Flash Builder 4 can work together smoothly and efficiently.

Flash Builder 4 Professional (formerly Flex Builder Professional) adds robust testing tools such as profilers, network monitoring, an automated testing framework, integration with Flex unit testing, and command-line build support.