Third parties have added support for GNU Pascal, Free Pascal, Ada, C#, Go, Perl, and D. Xcode supports source code for the programming languages C, C++, Objective-C, Objective-C++, Java, AppleScript, Python, Ruby, ResEdit (Rez), and Swift, with a variety of programming models, including but not limited to Cocoa, Carbon, and Java.
3.1 Xcode 1.0 - Xcode 2.x (before iOS support).