Factor is a concatenative programming language where references to dynamically-typed values are passed between words (functions) on a stack. Learn more about this paradigm.

Why Factor?

Factor is expressive, fast, supports interactive development (screenshot) and has a full-featured library. Factor applications are portable and the Factor implementation runs on all common platforms. Factor can deploy stand-alone applications on all platforms.

• Learn more about Factor - a page on the concatenative.org wiki; most of the other links below also link here
• Get answers to frequently-asked questions
• Get started programming with Factor
• Read Factor reference documentation online

License

Binaries

New! A Twitter feed of binary releases is now available: @FactorBuilds.

Binary packages are the recommended way to use Factor for new users and casual dabblers. To download a binary, just click the link for your desired CPU/OS combination. Binaries are built by the build farm, and release dates are in YYYY/MM/DD format. Software archaeologists might be interested in historical Factor versions.

Sources

GIT repository - browse using github or gitweb

More

• Join the mailing list
• Join the IRC channel
• planet.factorcode.org - Factor community blogs
• Factor community pastebin - if you're in an IRC channel and want to share some code

Factor is under intense development by a core team of developers working on the language implementation full-time, as well as a number of contributors. The Factor web server and framework, known as Furnace, powers factorcode.org, concatenative.org and tinyvid.tv. Factor's web server can serve static as well as dynamic content without any external software such as Apache.