Fortran is one of the earliest imperative computer programming languages around. It is often used for scientificand numeric programs. This page lists free Fortran compilers for various operating systems. Note that the differentsoftware listed are compliant with different Fortran standards, eg, ANSI Fortran 77, Fortran 95, Fortran 2003,Fortran 2008, Fortran 2018, and so on, so be sure to get the appropriate one for your purpose. Some of them may alsocome complete with debuggers,editors and anintegrated development environment (IDE).
FORTRAN compilers are not as smart as human. Sometimes, it would just keep processing your program until it hits a road block. At that moment, it is too late for the FORTRAN compiler to give you any meaningful message.
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Free Fortran Compilers and IDEs
FlangFlang is the Fortran compiler front end of the LLVM project (which also includes other compilers, suchas a C/C++ compiler).The current version (as at the date this was written) implements Fortran 2003 (with some features fromFortran 2008), while the next version (currently foundhere) implements Fortran 2018.The link above leads to the source code for the compiler. Thedownloadable binaries (ie, executables)can be found here. Note that the binaries are for Linux (both x86-64 and OpenPOWER) only, although work ona Windows port has begun.
AOCC FortranThe AMD Optimizing C/C++ Compiler Suite (or 'AOCC') includes an optimizing Fortran compiler that can generate code for32-bit and 64-bit Linux systems. It also comes with optimized libraries.
Fortran 90 Compiler Mac
MinGW'S G77 (GNU Fortran)This system comes with the GNU G77 Fortran compiler (among other things, including aC/C++ compiler), which you can use to generate Win32 executables fromF77 code. Like many systems based on the GNU tools, Mingw32 comes with complete with various programming tools,such as a program maintainence program (ie, make), text processing tools (sed, grep),lexical analyser generator (flex), parser generator (bison), etc.
Gfortran - the GNU Fortran Compilergfortran, part of the GNU Compiler Collection, is a free Fortran 95/2003/2008 compiler. Like all things from GNU, it comeswith source code. Precompiled binaries (executables) are available for Windows, Linux, Mac OS X, the old Mac OS (PPC), etc.
Silverfrost FTN95 Personal EditionSilverfrost FTN95 is a Fortran 95 compiler that supports Fortran 77, Fortran 90 and Fortran 95. The compiler generates32-bit and 64-bit exectuables for Windows and the Microsoft .NET framework. It comes with CHECKMATE,a tool that lets programmers check the correctness of their code at runtime. Also included is Plato 3 (an IDE),full source level debugging, documentation and examples. You may only generate code for your personal use on yourhome computer, and all executables will display a banner on execution.
Open Source Watcom / OpenWatcom Fortran CompilerFortran 90 Compiler Mac
The Watcom (now OpenWatcom) Fortran 77 compiler is now available free of charge, complete with source code.This compiler, which generates code for Win32, Windows 3.1 (Win16), OS/2, Netware, MSDOS(16 and 32 bit), etc, was a well-known compiler some years back (until Sybase terminated it).
G95[Update (17 November 2020): their website does not seem to be working correctly, withonly a partial change log on the main page, and no links to the compiler or anything else. I'm not sure ifthis is just a temporary situation (eg, due to an error in their web server configuration, such as failing toinstall PHP, since there are fragments of PHP code on the page), or if the site has really gone.]
G95 is an open source Fortran 95 compiler. At the time this was written, most of the ISO Fortran 95 standardhas been implemented. Platforms supported include Linux(x86, Intel IA64, AMD x86_64), Windows, Macintosh OS X, FreeBSD,Sparc Solaris and HP-UX.
Oracle Developer StudioThe Oracle Developer Studio includes C, C++ and Fortran compilers for Linux (specifically the Red Hat and Oracledistributions) andSolaris. Based on information displayed on the download page at the date this entry was written, it looks like you canfreely use the compiler for developing commercial applications if you wish. (As with all software, you should of courseverify this yourself, since the situation sometimes changes over time.)
f2j - Fortran to Java Compilerf2j translates Fortran 77 source code to Java class files. It is distributed under theGNU GPL and runs on Linux, SunOS/Solaris.
F2C - Fortran to C TranslatorThis is a well-known Fortran to C converter that comes with source code. The site alsoincludes pre-compiled binaries (executables) for MSDOS and Microsoft Windows, althoughthese are by no means the only systems supported - the compiler works on Unix systems likeBSD, Linux, etc. You have to compile the compiler yourself on those systems.Libraries containing the runtime support needed (together with the C source code)are also included. You need a C compiler to generatebinaries from your Fortran sources.
DJGPP GNU G77 (Fortran 77) for MSDOSThis is a development system based on the well-known GNU compiler system that includes compilers for Fortran 77,C, C++, Objective C, etc.It generates 32 bit MSDOS executables that is Windows 95 long-filename-aware. It is a very complete system with IDEs,graphics libraries,lexical analyser generators (flex), parser generators (bison),text processing utilities (like grep, sed),a program maintainence utility (ie, make),a DOS extender, and so on. The compiler,utilities and libraries come with source code.
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- FORTRAN Unit Test Framework (FRUIT) v.2.7FORTRAN Unit Test Framework, written in FORTRAN 95. So that all FORTRAN features can be tested. FRUIT has assertion, fixture, setup, teardown, report, spec, driver generation. Rake used as build tool. Tutorials at ...
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- Open Watcom v.1.9Open Watcom is a project of the open source community to maintain and enhance the Watcom C, C++, and Fortran cross compilers and tools. An Open Source license from Sybase allows free commercial and non-commercial use of Open Watcom. In a single ...
- Doxygen for Mac OS X v.1.7.6.1Doxygen is a documentation system for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors), Fortran, VHDL, PHP, C#, and to some extent D. It can help you in three ways: 1. It can generate an on-line documentation browser (in ...
- Numpy for Mac OS X v.1.6.1NumPy is the fundamental package needed for scientific computing with Python. It contains among other things: * a powerful N-dimensional array object * sophisticated (broadcasting) functions * tools for integrating C/C++ and Fortran code * ...
- Blitz++ Library v.0.9Blitz++ is a C++ class library for scientific computing which provides performance on par with Fortran 77/90. It uses template techniques to achieve high performance. Blitz++ provides dense arrays and vectors, random number generators, and small ...
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- Freesteam v.2.0Open source steam property routines in C. Implements the IAPWS-IF97 steam tables from the International Association for the Properties of Water and Steam. Includes two-way property solvers and test suite. Can be used from C/C++, Fortran Python and ...
- Ftagshtml v.0.521Ftagshtml converts fortran code into HTML in order to browse and navigate in the call tree for any routine or abstract fortran 90 interface. Compatible with basic C analysis, mixing with fortran 77 and ...
- Generating derivative structures v.1.0A Fortran 95 implementation of an algorithm for generating derivative structures of a parent lattice. The algorithm is discussed in detail in: Gus L. W. Hart and Rodney Forcade, 'A new approach to generating derivative structures,' Phys. Rev B.
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