What development tools can build 64 bit programs for Windows x64 and/or Mac?

Delphi does not yet support building 64-bit applications. What common tools are there for building native 64 bit 开发者_高级运维programs, especially with an IDE? For instance, I believe that Visual Studio supports this. Anything else?

On Mac, Xcode builds 64-bit apps. Bear in mind that you must use the Cocoa UI APIs.

Visual Studio 2005, Visual Studio 2008, Free Pascal x64.

Delphi XE2, with FireMonkey, now supports Windows x64 and the Mac OS.