Kronolith is the Horde calendar application. It provides a stable
and featureful individual calendar system for every Horde user, with
integrated collaboration/scheduling features. It makes extensive use
of the Horde Framework to provide integration with other
applications.

Right now, Kronolith implements a solid, stand-alone calendar system,
allowing repeating events, all-day events, custom fields, keywords,
shared calendars, iCalendar support, generation of free/busy
information, and managing multiple users through Horde
Authentication. The calendar API that Kronolith uses is abstracted
such that it could work with any backend, but right now we provide
SQL (abstracted to support most databases, including MySQL,
PostgreSQL, Oracle, and MSSQL via PEAR DB), and Kolab backend
libraries.