Nu is an interpreted Lisp that I wrote on the Objective-C platform in 2007. It's the fastest and simplest way to work interactively with Objective-C components. Nu has been used on Mac OS X, Linux, and iOS and is extremely easy to integrate. The Nu source code is available on GitHub.
I've recently become a user of the Go Programming Language, particularly on Google App Engine. This website is built with Go and runs on Google App Engine. I hope to have more to share about Go and App Engine soon.
For more, explore my source code repositories on GitHub.