CMakeCross-platform build system generator that describes a build once and produces native project files for every compiler and IDE — the de facto standard for building C and C++ software.curlCommand-line tool and library (libcurl) for transferring data over dozens of protocols, maintained by Daniel Stenberg since 1998. Embedded in cars, phones, TVs, printers and space hardware, it is plausibly the most widely deployed software component on Earth.GitDistributed version control system written by Linus Torvalds in 2005 for Linux kernel development after the BitKeeper licence dispute. Its content-addressed model made every clone a full backup of a project's history — a preservation property that reshaped how software is kept and shared.GNU Compiler CollectionThe GNU Compiler Collection, the free compiler Richard Stallman began in 1987 that made the rest of free software possible — for decades the compiler that built the world's operating systems, and still the reference for C and C++ on free platforms.GNU EmacsThe extensible, self-documenting text editor, in continuous development since 1976 and one of the founding programs of the GNU project and the free software movement itself. Its Emacs Lisp core lets it become anything — mail reader, organiser, IDE — which is why it has outlived generations of editors.GoStatically typed compiled language from Google (2009) designed for simplicity, fast builds and effortless concurrency. It became the language of cloud infrastructure — Docker, Kubernetes and much of the container ecosystem are written in it.Godot EngineFeature-complete 2D and 3D game engine with its own scripting language, visual editor and one-click export to every platform, under the permissive MIT licence. After commercial engines burned developer trust in 2023, it became the community's engine of choice.LLVMCompiler infrastructure whose reusable intermediate representation powers Clang, Rust, Swift, Julia and countless other languages and tools. Started as a university research project, now the shared foundation of modern compilation.NeovimCommunity-driven refactor of Vim with a Lua configuration language, built-in LSP client and an RPC API that lets the editor be embedded anywhere. It revitalised the modal-editing tradition for a new generation.Node.jsJavaScript runtime built on the V8 engine that in 2009 brought the browser's language to servers and command lines, creating one of the largest software ecosystems ever (npm). Governed openly by the OpenJS Foundation.PythonGeneral-purpose programming language created by Guido van Rossum in 1991, whose readable syntax carried it from teaching language to the lingua franca of science, data analysis and machine learning. Developed openly by the Python Software Foundation.RustSystems programming language begun at Mozilla that guarantees memory safety without a garbage collector through its ownership model. Now under the independent Rust Foundation, it is the first new language admitted into the Linux kernel.VimThe ubiquitous modal text editor, Bram Moolenaar's 1991 improvement of vi, present on practically every Unix-like system in existence. Distributed as charityware supporting children in Uganda, it shaped how millions of programmers edit text.VSCodiumCommunity build of the VS Code source tree with Microsoft's telemetry, branding and proprietary licence removed — the same editor, but actually free. A textbook example of why source availability alone is not enough without free binaries.
