CalDAV has been a standard for internet calendar products. Using Microsoft Outlook to connect to CalDAV compliant calendar servers will allow users to take advantage of the rich functions offered by Outlook and have alternatives for calendar servers.
FinchSync is a tool for synchronizing contacts, appointments and tasks from Mozilla email and calendar products with a Pocket PC or SmartPhone.
Helper is an integrated PIM and social networking (blog, RSS, foaf, etc) client. Allows to store, annotate and navigate information uniformly by means of folders, tags and categories. Based on OWL, Eclipse RCP and open standards (Dublin Core, foaf, etc).
Organizer is PIM program including calendar, contacts, tasks, notes and synchronization with MS Outlook and SE Phone
The goal of the SWT Diary Project is to produce a pluggable SWT based diary/calendar system similar to other diary components such as Mozilla Lightning.