Taru is appointment scheduler that was designed for use within a university for scheduling demo times between course assistants and students. It includes support for calendar synchronization with iCal and Google. Taru means "to be sufficient, to be enough" in Japanese and "myth" in Finnish.
Nevede is a Web application to schedule events easily. When you start planning an event with Nevede, each participant can to go to the event's Web page to express availability. The event's page will then show the time slots that are compatible with the schedules of all the participants. Events can be made public or private. Comments can be posted in meeting pages.