Rb-skypemac is a project mainly written in RUBY and JAVASCRIPT, it's free.
A fork of http://rb-skypemac.rubyforge.org/svn/
0.3.0 Adds support for:
0.2.0 Include support for calling, managing calls, and managing users. Most invocations are made via the Skype class which abstracts much of the Skype API, delegating calls to the constituent objects in the official Skype API.