Calcium provides interactive Calendars you use through your browser. Features include: dynamic calendar merging (events from one calendar can be included in another); multiple views and formats; repeating events; email reminders; color and font customization; support for full HTML in event text and calendar headers and footers; popup text associated with any event; searching & filtering; multi-language support; flexible security model, and more. Calcium is very easy to use, and fully supported. It runs anywhere that supports Perl CGIs; no non-standard Perl modules necessary.