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
Monsoon is a Java application that allows users to create multiple Todo lists.
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.