Address Book Server allows you to share your contacts and calendar events with others connected to your network or over the Internet. Each participant synchronizes their contacts with the server hosted on your own system. Address Book Server supports the full Address Book and iCal schema. The server also provides a friendly Web interface and an iPhone client which let you access your contact details remotely.
Wyrd is a curses front-end for Remind, a powerful calendar and alarm application. The display features a scrollable time table suitable for visualizing your schedule at a glance. Wyrd integrates with an external editor of your choice to make editing of reminder files more efficient, and provides hotkeys to quickly access the most common Remind options. Other features include extensive configurability, Mutt-like interface design, and minimal resource requirements.
DAViCal is a server implementation of the CalDAV protocol for storing calendaring resources (in iCalendar format) on a remote shared server. An increasing number of calendar clients support the maintenance of shared remote calendars through CalDAV including Mozilla Calendar (Sunbird/Lightning), Evolution, Mulberry, Chandler, and various other closed-source products such as Apple's iCal and iPhone. DAViCal supports basic delegation of read/write access among calendar users, multiple users or clients reading and writing the same calendar entries over time, and scheduling of meetings with free/busy time displayed.
todoyu is a powerful project and task management system. The core features are project handling, time tracking, time sheets, resource management, calendar, customizable reporting, keeping track of communication and decisions, invoicing directly from tracked time, and address management of customers and employees. It improves billing accuracy and timeliness, and removes risk from the billing process. A todoyu customer's clients get visibility into the project work done on their behalf. The system is extensible with additional modules. The system is completely Web based and translated in 12 languages.
Googsystray is a system tray app for Google Voice, GMail, Google Calendar, Google Reader, and Google Docs. It lets you keep track of the information provided by those services without having to keep a bunch of Web pages open or constantly checking them. It notifies you of new events, such as messages or alerts, and provides basic services quickly.
GCalert will access all your Google calendars and display alarms via libnotify for whenever you have alarms set for each event. These alarm widgets do not receive focus (and thus do not take keyboard input away from other applications), yet are clearly visible even on a cluttered desktop.
tngCalendar is a Web calendar addon to the TNG software for online genealogy. It adds a convenient view of your family history, overlaying anniversaries of births, deaths, and marriages on top of an easy-to-understand calendar. It can be dropped in-place over a commercial TNG installation, or installed in a parallel directory.