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"This document is an introduction into using Guile, the GNU extension language and system. Guile is a dialect of the Scheme programming language, and I will assume you're at least confident about the very basics of Scheme or LISP in general.
"Scheme is a programming language, but Guile—an interpreter and library for Scheme—transforms it into an embedded scripting language, making it ideal for bringing dynamic new life to your static applications. Take a quick tour of Guile, and discover its powerful features for building extensible applications..."
Guile is a library designed to help programmers create flexible applications. Using Guile in an application allows programmers to write plug-ins, or modules (there are many names, but the concept is essentially the same) and users to use them to have an application fit their needs.
There is a long list of proven applications that employ extension languages. Successful and long-lived examples in the free software world are GNU Emacs and The GIMP.
«I'd like to share with you all here some writing that I did last month for Guile's manual. It runs through the 15-year history of Guile Scheme, re-visions a commonly misunderstood episode, and gosh darnit I just really like "the emacs thesis"...
"Thanks to OpenEmbedded building extensions for Guile that run on embedded devices such as the BeagleBoard is fairly painless [...] As an example I built packedobjects as a Guile extension for my BeagleBoard..." -- via globa
Guile is an implementation of the Scheme programming language, with support for many SRFIs, packaged for use in a wide variety of environments. The new release provides many new noteworthy features, most notably the addition of a compiler and virtual machine. We encourage you to test them and provide feedback.