| Bash | Shell and command language supported by the Free Software Foundation. |
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| C | General-purpose language foundational in systems and application programming. |
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| Ciao | Modern Prolog implementation focused on portability, extensibility, and modularity. |
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| Clang | Compiler front end for C, C++, Objective-C, and Objective-C++, integrating with LLVM. |
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| Clozure CL | Free Common Lisp implementation offering full ANSI compliance and several extensions. |
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| Crystal | Compiled, statically-typed language with Ruby-like syntax and type inference. |
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| D | Modern system programming language influenced by C++ with multiple paradigms and expressive features. |
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| Eiffel | Object-oriented programming language emphasizing design by contract. |
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| Elvish | Versatile scripting language and interactive shell with cross-platform binary support. |
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| Euphoria | User-friendly language focusing on simplicity and readability, popular for various applications on multiple OS platforms. |
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| Free Pascal | Pascal compiler supporting multiple architectures and dialects. |
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| FreeBASIC | BASIC compiler inspired by QuickBASIC, supporting object-oriented programming. |
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| GDB | Portable debugger for Unix-like systems supporting various languages. |
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| GDScript | High-level, dynamically typed language for the Godot Engine. |
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| Gleam | A general-purpose, functional language that compiles to Erlang and JavaScript, featuring static, inferred typing for concurrent programming. |
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| GNAT | Free Ada compiler in the GCC suite, supporting all Ada versions. |
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| Go | Statically typed, compiled language with memory safety and CSP-style concurrency, designed at Google. |
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| Haskell | Statically-typed, purely functional language known for type inference and lazy evaluation. |
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| HCL | Declarative configuration language used in Terraform to define cloud infrastructure resources. |
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| HotSpot VM | Java virtual machine known for its just-in-time compilation and adaptive optimization techniques. |
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| jq | Lightweight and flexible command-line JSON processor. |
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| Julia | A dynamic language designed for numerical and scientific computing with strong support for parallel computing and multiple dispatch. |
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| KornShell | Unix-based shell that combines features from C and Bourne shells, supporting POSIX standards. |
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| Mercury | A logic-based programming language with functional features. |
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| Nim | Statically typed, compiled language focusing on performance and elegant syntax, compilable to C, C++, and JavaScript. |
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| Nix | Cross-platform, functional package manager and language with immutable directory management. |
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| Pascal | An imperative and procedural language designed by Niklaus Wirth, known for encouraging structured programming and data structuring. |
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| Pony | Object-oriented, actor-model, secure programming language. |
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| Pure | Based on term rewriting, integrating symbolic computation and JIT compilation via LLVM. |
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| Python | Dynamic, high-level programming language known for its easy-to-read syntax. |
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| Rakudo | The main compiler for the Raku language, targeting MoarVM and JVM. |
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| Roff | Typesetting language originating from UNIX, known for derivatives like 'troff' and 'nroff'. |
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| SBCL | Open-source, high-performance Common Lisp implementation derived from CMUCL. |
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| sed | Unix utility that parses and transforms text, using a compact programming language developed by Lee E. McMahon. |
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| Standard ML | Functional programming language known for its type inference and usage in compiler writing. |
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| SuperCollider | Real-time audio synthesis and music composition. |
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| SWI-Prolog | Implementation of Prolog focused on versatility and rich libraries. |
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| V | Statically typed, compiled language emphasizing simplicity and performance. |
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| Vala | Object-oriented language that generates C code using the GObject system. |
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| Vim script | Vim script is the scripting language built into the Vim text editor, designed for user customization. |
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| Visual Basic | Multi-paradigm language developed by Microsoft for Windows applications. |
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| Zig | System programming language designed as an improvement over C/C++ with native error handling and performance enhancements. |
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