Recommendation: Use gfortran (GCC) via a packaged Windows distribution (MSYS2, MinGW-w64, or TDM-GCC) or via Windows Subsystem for Linux (WSL). This gives the best combination of compatibility, support, tooling, and active maintenance.

For developers who strictly want the classic GNU G77 compiler wrapped in a simple graphical interface, Force 2.0 is a historical favorite.

Download source : MinGW-w64 or MSYS2 .

I can provide tailored compilation flags or configuration steps based on your needs. Share public link

Force is an older, classic IDE integrated with the original GCC g77 compiler.

It is designed specifically for Windows, allowing for easy compilation and creation of Windows GUI applications via ClearWin+. It is often considered easier to set up for beginners than MinGW. 3. Open Watcom V2

Silverfrost FTN95 is a dedicated Fortran compiler for Windows that offers full FORTRAN 77 compatibility.

Most users needing a robust, production-grade command-line compiler. 2. Silverfrost FTN95 (Express Edition)

Because standalone, native FORTRAN 77 compilers are largely obsolete, modern developers use updated compilers that maintain full backward compatibility with the FORTRAN 77 standard (ANSI X3.9-1978). 1. GNU Fortran (gfortran) via MinGW-w64

Using gfortran via the MinGW-w64 project is the most reliable method for Windows 10 64-bit. Follow these steps to download and configure it. Step 1: Download the Installer

For those needing maximum performance, Intel renamed their famous "Intel Fortran Compiler" to and made it free as part of the oneAPI toolkits.

There are several Fortran 77 compilers available for Windows 10 64-bit, both free and commercial. Here are a few options:

Click and paste the path to your MSYS2 binary folder: C:\msys64\ucrt64\bin Click OK on all windows to save changes. Compiling Your First FORTRAN 77 Program

Are you compiling or writing new programs ?