1 The World Wide Web nowadays is sprinkled with so many rich applications and to be frank they are a bitch to make.
2 In case of Flex there is the Flex Builder that is based on the Eclipse Platform and is going to cost you just some dollars when coming to HTML5 ther..
3 WHATWG group is putting its efforts to work on the open HTML5 Spec but most of the Web Browser Runtimes are closed however Adobe Flex has open sourc..