I have been working on a special project several months ago, which was really fun to develop and apparently the guy I've been doing it for loves it, so I present you proudly:
But first, a story for ya: We were working on a project which needed scripting support for users, but not harm the system or data. The available sandboxing php script was very unhandy and no other options were around. We first thought about implementing other scripting languages (Lua, python), but realized that integrating them as php extension would be a lot of work. So we sat around and developed a specification for a custom language, which we thought was a some awesome way to do this, we gave it the name AwesomeScript :)
The repository is available at github:
Have fun and feel free to fork me on github!
PS: There are no released projects available, but I'm working with Cpojer on several, so stay tuned!