Spicebird, desktop collaboration tool

Spicebird (created by Synovel Technologies) is a desktop, Mozilla-based collaboration suite that integrates email, calendar-sharing, and instant messaging into one application. Spicebird is built on Thunderbird (for email), Lightning (for calendar sharing), and SamePlace (a firefox extension that provides instant messaging).

Unfortunately, Spicebird has not been released to open source alpha yet, but soon. To see a demo of Spicebird, click here.