Mesa Dynamics has introduced a free lightweight desktop instant messaging client for the Mac, compatible with multiple IM services.

Gabtastik is a WebKit based Site Specific Browser (SSB) for web chat services such as Facebook Chat, Google Talk and meebo. meebo itself supports AIM, Yahoo, MSN and other IM services, making the free application a viable client for chat using multiple services, including application-based IM. 

The application means Mac users can engage in chat using these popular web-based chat services without using their browser, making for savings in screen space and memory use.

Users can control the window display level, window opacity, and toggle quickly between supported chat services. The software requires Mac OS X 10.4 or later and Flash Player. It is available now for download.