Freshmeat page: http://freshmeat.net/projects/guile/
Guile is an embeddable Scheme interpreter. It will also support translation from other languages in the future. It is the official GNU extension language. It is used either as a scripting language or as the actual implementation language in a number of projects including Galway, Gnumeric, Guppi, SART, Scwm and Siag Office.
License: GGPL (GPL w/ special exceptions)
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!