Nasal scripting language
Nasal is a language that I wrote for use in a personal project. Ostensibly it was because I was frustrated with the dearth of small-but-complete embeddable scripting languages, but of course I really wrote it because it was fun. It is still young and incomplete in a few places, but is under active development and has been integrated as the extension language for the FlightGear simulator.
Documentation is still sparse. There is a design document available, which talks at length about the "why's" behind the design of Nasal and includes documentation for the built-in library functions. More useful to the experienced programmer is the tutorial-style sample code, which explains and demonstrates all the syntax features of the language.
Source code is available under the terms of the GNU LGPL:
$ git clone git://github.com/andyross/nasal
Questions and comments can go to the author, Andy Ross, via email at andy@plausible.org.