SproutCore is Apple's Flash, Silverlight-killer - Mac software - Macworld UK Sproutcore is a new Ajax/JavaScript framework being developed as an outgrowth of Apple's new MobileMe product. It's also part of the ongoing rapid development of the iPhone development platform and the WebKit browser engine that forms the basis for Safari. To call it a "Flash killer" is perhaps a bit overstating the case, but judging from the demos on the Sproutcore website, it appears to be on its way to being a robust rival to more mature frameworks such as Ext.js. I've installed Sproutcore and look forward to playing around with it soon.