Plans, the best web calendar.
Users say:
I was almost ready to pay for a similar but inferior product when I stumbled across your calendar. This project has everything I was looking for. Thank you for your contribution to the Open-Source community.

Who uses Plans?

Plans is currently used by:

See what Google has to say.

Plans has an entry on Freshmeat, where some folks have posted comments.

TotalChoice Hosting has detailed instructions for running Plans on their servers.
(Disclaimer: has no business relationship with TotalChoice Hosting.)

(Disclaimer-er: In fact, has no business relationship at all. The ".com" is sort of misleading.)