FORTRAN 77 Compilers

Platform	Compiler Name	Notes
Amiga	Absoft FORTRAN 77
Amiga	BC-FORTRAN	ANSI only
Atari ST	BC-FORTRAN	ANSI only
Apple II	Apple FORTRAN	ANSI only (partial)
C64	Abacus Fortran-64	subset of FORTRAN 77
CP/M-86	Digital Research FORTRAN 77
UCSD	SofTech Microsystems FORTRAN	UCSD p-System, ANSI only
DOS	BC-FORTRAN	ANSI only
	G95	32-bit (DJGPP)
	GNU Fortran	32-bit (DJGPP)
	GNU g77
	IBM Professional FORTRAN	rebranded Ryan-McFarland
	Lahey F77L-EM/32	32-bit
	Lahey Personal FORTRAN 77	16-bit
	Microsoft FORTRAN 4/5	16-bit, 32-bit
	Microway NDP FORTRAN-486	32-bit
	Open Watcom FORTRAN 77	16-bit, 32-bit (DOS/4G)
	Prospero Fortran
	Ryan-McFarland RM/FORTRAN
	Salford FTN77
	Watcom WATFOR-77
OS/2	Microsoft FORTRAN 4/5
	Open Watcom FORTRAN 77
	Prospero Fortran
Multics	FORTRAN
UNIX	Absoft Pro Fortran	Linux
	Apogee-FORTRAN 77	Solaris
	Bell Labs f77	default on UNIX, by Feldman & Weinberger
	Cray CF77, CF90	COS, UNICOS
	F18/Flang	LLVM ≥ 13
	Flang	LLVM
	Fujitsu Fortran	Linux
	G95	Linux
	GNU Fortran	GNU Compiler Collection
	IBM XL Fortran	Linux, AIX
	Intel Fortran Compiler
	Intel oneAPI Fortran
	LFortran	LLVM
	NAG Fortran Compiler	Linux, Solaris
	NVIDIA/PGI NVFORTRAN	Linux
	Open64	Linux
	Open Watcom FORTRAN 77	Linux
	Oracle Fortran Compiler	Linux, Solaris
	The Portland Group PGF77	Linux, Solaris
	Siemens-Nixdorf FORTRAN 77	Linux
	Sun Performance WorkShop Fortran	Solaris
Win16	Microsoft FORTRAN PowerStation 1.0
Win32	Absoft Pro Fortran
	Digital/Compaq Visual Fortran
	G95	MinGW
	GNU g77
	GNU Fortran	MSYS2, MinGW, Cygwin
	Intel Fortran Compiler
	Intel oneAPI Fortran
	Lahey/Fujitsu LF Fortran Pro/Express
	Microsoft FORTRAN PowerStation 32
	Microsoft FORTRAN PowerStation 4.0
	Open Watcom FORTRAN 77
	Salford FTN77
	Silverfrost FTN95
	The Portland Group PGF77
.NET	Silverfrost FTN95

Table 1: An incomplete overview of FORTRAN 77 compilers

Translators

f2c -- FORTRAN 77 to C, last resort when there is no FORTRAN compiler
f2cl -- FORTRAN 77 to Common Lisp translator
f2cpp -- Perl script to convert FORTRAN 77 to C++ (requires GNU Fortran runtime)
f4go -- FORTRAN 77 to Go
f2j -- subset of FORTRAN 77 to Java
f2j -- another Java converter of the same name
f2perl -- translates FORTRAN 77 to Perl
f2py -- Fortran to Python
f2what -- open-source project to translate algorithmic FORTRAN to a variety of languages

Utilities

Software tools to convert FORTRAN 77 source to Fortran 90 source and vice versa:

to_f90 -- Alan Miller’s tool for converting FORTRAN 77 to free-form Fortran 90
f2f -- Perl script that converts F77 to F90
f2f90 -- FORTRAN 77 to Fortran 90 converter, by Peter Rochford
F77_TO_F90 -- another converter, by Michael Metcalfe
F90_TO_F77 -- conversion of Fortran 90 to FORTRAN 77, by John Burkardt
FIXON -- F77 to F90 continuation scheme converter
Online F77 to F90 converter
Modernising old Fortran -- Fortran Wiki

FORTRAN 77 program documentation:

for2html -- FORTRAN 77 to HTML translator, written in Perl
ROBODoc -- documentation tool that extracts the documentation from your source code and formats it in HTML, RTF, TeX, XML DocBook (PDF), or ASCII