Factor

Factor is a concatenative, stack‑based programming language that offers high‑level constructs such as dynamic typing, extensible syntax, macros, and garbage collection. Its implementation compiles code for performance while also supporting an interactive development environment, allowing programmers to experiment and debug directly in the REPL. The language includes a comprehensive standard library covering combinators, I/O, mathematics, parsing, and sequence manipulation, and it is documented extensively.

The language runs on macOS, Windows, and Linux, and compiled are portable across these platforms. Users can distribute stand‑alone applications for any of the supported operating systems, and the full source code is released under a BSD license, enabling modification and redistribution. Binary packages are provided for quick installation, while source builds are also available via public repositories.

Factor targets developers interested in concatenative programming paradigms or those seeking a language that blends low‑level stack manipulation with high‑level abstractions. Its extensive library, cross‑platform support, and open‑source licensing make it suitable for both experimental projects and production‑grade software development.