Black Sheep is an easy to understand and use Java Address Organizer with some cool features. E.g. the Filter: Enter a part of a phone number and it shows the matching Addresses within the same second.
Golden Rules Organizer
Golden Rules Organizer is a desktop organizer and goal system.
It allows several planning levels, actual effort tracking, mind mapping, and contact management, providing function-rich goal system for both beginners and professionals.
(shareware) a cross-platform PIM - Java Contactor runs on all these platforms: Microsoft Windows, Macintosh, Sun, AIX, Linux, BSD, HP-UX
Java iCal Group Scheduler
enable several users to get together for a meeting by using JICAL to translate their iCalendar files into their available free/busy time and post it automatically to your web server
Java Information Manager: a Personal Information Manager written in Java
Makagiga is an open-source, easy-to-use, portable application for doing a variety of tasks, such as todo listing, text editing, or RSS reading. Plugins are used to implement its various capabilities. Read more
written in Java and using the Cryptix JCE Cryptograpic library. It uses a combination of BlowFish and TripleDES to encrypt Diary entries
VaporMail is a cross-platform, open source enterprise personal information management system. It is designed to offer these primary features: messaging, scheduling, contact management, task/workflow management, and knowledge management.