NAG Fortran Builder 5.2 is an Integrated Development Environment (IDE) for the Microsoft Windows version of the NAG Fortran Compiler. Its features include a GUI debugger, an integrated help system and NAG Library support with additional libraries OpenGL, GTK+ and informative runtime error messages. The product has a quick execution mode, a improved Random Number Generator, with memory leak detection built into the compiler. Users can set default Project Settings & reset option and the product has informative runtime error messages.