Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
BKchem - BKChem is a free (as in free software :o) chemical drawing program.
Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.
GPeriodic - GPeriodic is a periodic table application for Linux.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.