Apple has now allowed free Xcode 4 download for Mac OSX Lion from the Mac App Store. Previously members of the iOS and Mac Developer Programs ($99/yr membership) could only get Xcode 4 free downloads. Now if you buy Mac OS X Lion, you can get Xcode 4 free.
Xcode is a popular toolset for building Mac OS X and iOS applications by developers. The new Xcode 4 is great developer tool for creating apps for Mac, iPhone, and iPad and includes Xcode IDE, Instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs. Xcode 4.2 Developer Preview is also available to Paid iOS Program Members.
Xcode 4 has a great new interface that integrates UI design, coding, testing, and debugging, all within a single window. The embedded Apple LLVM compiler underlines coding mistakes as you type, and will fix the problems for you automatically.
Download Xcode 4 Free at iTunes Mac App Store. Requires Mac OS X 10.7 or later. Download size 2.96 GB.