k5nCal (k5n Desktop Calendar) is a desktop calendar and you can also insert journal entries, leverages existing standards (iCalendar, iMIP, iTIP, CalDAV) to create an open source cross-platform multi-user desktop calendar application. k5nCal will help you plan future events and also insert journal entries.

k5nCal Features:
1. Simple and intuitive user interface
2. Supports Mac OS X, Linux or Windows (requires Java 1.5)
3. Import calendar data in iCalendar (RFC2445) or CSV (MS Outlook) format
4. Subscribe to remote calendars (icalshare.com, etc.)
5. Open source license: Use it free of charge , or download it and modify the source code.
6. Under active development: ask for a feature or get help and support.

Requirements:
* Java

The license of this software is Free, you can free download and free use this calendar software.