Support for the Intel Debugger has been deprecated — in the Intel Fortran Composer 2013 product — with the last released version being 13.0.1 (2013). For Linux and OS X, Intel supports extensions to the GNU Debugger (the GDB provided with Intel Composer XE 2013 SP1 is based on GDB 7.5). Intel maintains a fork of GDB and works on its relevant bugs to get them implemented upstream. For Windows, Intel supports extensions to the Visual Studio Debugger. The parallel debugger extension enables additional capabilities for debugging parallel programs and is available for Visual Studio (2005 and 2008).