I've written a few little libraries:

• NSTerminal: A little library to ease writting command line apps in Obj-C
• libcondset: A C++ library that let's you pragmatically manipulate and serialize predicates.

I know these languages (in order of fluency):

• Ruby (off Rails)
• Objective-C (Cocoa Touch, Cocos2d, Cocoa)
• Some Python (Google App Engine, Flask)
• C(++)
• Bash shell Scripting
• Some jQuery
• Some x86 assembly (enough that I'm trying to clone DOS)
• Common Lisp
• A tiny bit of C#

I'm a Linux user (as you can probably tell).