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.
AddressBook X LDAP provides a shared addressbook on your local network, without the burden of subscriptions. It is an iSync enabled application which transfers contacts from the AddressBook to a central LDAP directory. It also provides the ability to browse and search the directory. Multiple schema mappings are available and can be customized and extended to address individual needs. Currently, ABxLDAP Person (an extension to InetOrgPerson) is fully supported, but the Mozilla Schema and the basic InetOrgPerson are in development. Support for Active Directory is included as well.
Addresses is a GNUstep address book that consists of a full-featured address book manager application, a source-code compatible replacement for Apple's AddressBook.framework (for accessing and manipulating address data programmatically), a framework of view/editor classes that make it easy to use Addresses from your own programs, and a number of tools. It is easy to use by both users and programmers and can store almost all imaginable data, including multiple phone numbers, emails, and addresses, photos, AIM/Jabber/ICQ/Yahoo IM details, and notes. It supports drag-and-drop and integrates well with GNUMail.
AdslShare aims to be a powerful file sharing tool. It is built with modularity in mind. Each piece of the software is a plugin that can be loaded at start time. It currently has a GTK+ 2.x interface and a Gnutella protocol plugin. Planned features include the ability to download from different hosts, resume downloads and uploads, a new protocol with a more intelligent download engine, and a scripting interface.
Advertnet is tool for managing multiple networks of advertising boards, ready to work with Second Life. In Advertnet's model, the boards are attached to urban furnitures and can belong to different networks, thus forming ad campaigns. Differents types of objects can be attached to boards and networks: notecards, URLs, etc. Advertnet is composed of a Ruby on Rails application that can communicate with ad boards created in Second Life.
Aethera is a PIM application, i.e. it handles all kinds of personal information including email, contacts, notes, tasks, todos, and journals. It has various communication features including the ability to send and receive email, task requests, and appointment requests. It can also report the world's news and weather.