References & Resources

The final page of the track gathers everything you need to keep learning Fortran for free: run code in the browser with nothing installed, consult the authoritative standard and compiler documentation, follow a structured course, and read real Fortran written by people who solve hard problems with it every day. All links were verified for this revision.

Official Resources & Standards

The community and the standards bodies

Resource	What it is	Best for
fortran-lang.org	The official community website: learn, packages, compilers, news	Starting point for everything Fortran
Fortran-lang Learn	Quickstart tutorial, Best Practices, Python–Fortran Rosetta Stone, intrinsics pages	Official learning hub with curated courses
WG5	ISO/IEC JTC1/SC22/WG5 — the committee maintaining the standard	The standard's text, interpretations, future work
J3	US Fortran standards committee	Proposals and discussion of the next revision

Compiler documentation

Resource	What it is	Best for
GNU Fortran (gfortran) docs	Full reference: flags, intrinsic modules, every intrinsic procedure	Answers to "how does intrinsic X behave?"
Flang (LLVM)	The LLVM Fortran front-end	Comparing codegen, trying LLVM tooling
Intel Fortran (ifx)	Intel's standards-first compiler, free tier	HPC clusters, Xeon tuning, MKL integration
LFortran	Interactive Fortran compiler with a REPL	Notebook-style exploration and the playground

Playgrounds: no installation needed

Instant feedback is the fastest tutor. All three below run in the browser and are free:

Resource	What it is	Best for
LFortran Playground	Official in-browser interpreter with an interactive REPL	Trying a snippet in ten seconds, first contact
Compiler Explorer	Compile/run Fortran online with gfortran, ifx, flang; inspect assembly	Seeing exactly which instructions `-O3` produced
Replit Fortran	Collaborative online IDE with a gfortran environment	Sharing a broken program with a colleague

Learning the language

Resource	What it is	Best for
Quickstart Tutorial (via Learn)	The officially recommended first course	Structured revision after this track
Fortran Best Practices	Community canonical style rules	Writing code others can maintain
Python–Fortran Rosetta Stone	Common idioms side by side in Python/NumPy and Fortran	Translating your NumPy intuition into Fortran
Fortran Wiki	Editable community encyclopedia of Fortran articles	Depth on specific topics and history
EPCC: Introduction to Modern Fortran	Edinburgh Parallel Computing Centre course materials (video + slides)	A second voice on the same foundations

Parallel Programming & HPC

Resource	What it is	Best for
OpenMP	Official API spec and resources for shared-memory and offload parallelism (Fortran/C/C++)	The directive reference behind the parallel lesson
MPI Forum	The Message Passing Interface standard (current: MPI 5.0), documents and status	The normative text of every MPI call you use
OpenACC	Directive-based GPU programming standard	The other official offload path beside OpenMP target
HPC Wiki: How to Use MPI	Gentle tutorial covering MPI patterns in practice	Second reading of the MPI lesson with more context

Resource

What it is

Best for

OpenMP

Official API spec and resources for shared-memory and offload parallelism (Fortran/C/C++)

The directive reference behind the parallel lesson

MPI Forum

The Message Passing Interface standard (current: MPI 5.0), documents and status

The normative text of every MPI call you use

OpenACC

Directive-based GPU programming standard

The other official offload path beside OpenMP target

HPC Wiki: How to Use MPI

Gentle tutorial covering MPI patterns in practice

Second reading of the MPI lesson with more context

Data formats & libraries

Resource	What it is	Best for
Fortran Standard Library (stdlib)	The de-facto community standard library (strings, sorting, linalg, statistics)	Everything the standard deliberately leaves out
fpm — Fortran Package Manager	Build tool and package manager; tutorials, how-tos, registry docs	Project scaffolding, dependencies, publishing
BLAS reference / LAPACK reference	The canonical dense linear algebra subroutine libraries	Calling conventions and documentation of dgemm & co
netCDF / HDF5	Self-describing scientific data formats with Fortran APIs	Storing model output portable across decades
fortran2018-examples (scivision)	Standalone F2018/F2023 feature examples, 418 stars	Real code demonstrating every modern feature

Resource

What it is

Best for

Fortran Standard Library (stdlib)

The de-facto community standard library (strings, sorting, linalg, statistics)

Everything the standard deliberately leaves out

fpm — Fortran Package Manager

Build tool and package manager; tutorials, how-tos, registry docs

Project scaffolding, dependencies, publishing

BLAS reference / LAPACK reference

The canonical dense linear algebra subroutine libraries

Calling conventions and documentation of dgemm & co

netCDF / HDF5

Self-describing scientific data formats with Fortran APIs

Storing model output portable across decades

fortran2018-examples (scivision)

Standalone F2018/F2023 feature examples, 418 stars

Real code demonstrating every modern feature

The Python bridge

Resource	What it is	Best for
F2PY User Guide	Official NumPy documentation for wrapping Fortran into Python	The full workflow behind the python-interop lesson
Python–Fortran Rosetta Stone	NumPy ↔ Fortran idiom dictionary	Thinking in both languages at once

Resource

What it is

Best for

F2PY User Guide

Official NumPy documentation for wrapping Fortran into Python

The full workflow behind the python-interop lesson

Python–Fortran Rosetta Stone

NumPy ↔ Fortran idiom dictionary

Thinking in both languages at once

Community help

Resource	What it is	Best for
Fortran-lang Discourse	Friendly, active official forum	Questions the docs cannot answer
fortran-lang GitHub	stdlib, fpm, the website and tools	Reading real modern Fortran source

Resource

What it is

Best for

Fortran-lang Discourse

Friendly, active official forum

Questions the docs cannot answer

fortran-lang GitHub

stdlib, fpm, the website and tools

Reading real modern Fortran source

Next-steps map. Finished the track? Re-read your favourite lesson against the official source that inspired it — the gfortran docs for intrinsics, the Quickstart for structure, the OpenMP/MPI specs for parallelism — then pick one of the study projects and extend it until it breaks. That breaking-and-fixing loop, more than any single page here, is what turns a tutorial into an engineering skill.

Keeping references current. Documentation links move as projects restructure their sites. When a link here fails, the resource still exists — search the project name on the fortran-lang site or the Discourse, which indexes the whole ecosystem and is the most reliable entry point of all.