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## 1 Introduction

The GNU Fortran compiler front end was designed initially as a free replacement for, or alternative to, the Unix `f95` command; `gfortran` is the command you will use to invoke the compiler.

- About GNU Fortran: What you should know about the GNU Fortran compiler.
- GNU Fortran and GCC: You can compile Fortran, C, or other programs.
- Preprocessing and conditional compilation: The Fortran preprocessor
- GNU Fortran and G77: Why we chose to start from scratch.
- Project Status: Status of GNU Fortran, roadmap, proposed extensions.
- Standards: Standards supported by GNU Fortran.