Is it possible/feasible to build a large-scale Flex application for free?

I want to create a fairly large-scale Flex web application that has a similar interface style to Grooveshark.

When it comes to web development, I have always used the common PHP/HTML/JavaScript technologies. Now, I want to try something new and develop a RIA using Flex.

Using PHP/HTML/JavaScript, I am able 开发者_高级运维to develop my entire website with free tools. Now, I'm wondering if I am able to do the same thing with a Flex web application?

Is it possible/feasible to develop a Flex web application for free? If not, what would be the lowest cost I would need to spend? And, whatever the option, what are the tools that would be needed?

---

• Do I need Flex Builder?
• What is the best Flex IDE?
• https://stackoverflow.com/search?q=free+flex
• https://stackoverflow.com/search?q=flex+flashdevelop (if on Windows)

---

Have you been to Adobe's Flex website? You can do anything you need to with the free Flex SDK, available here http://www.adobe.com/cfusion/entitlement/index.cfm?e=flex4sdk.

To develop without Flex Builder will be more tedious and require a more in-depth understanding of how to position and organize graphic elements. I hope you have lots of time :)