plnohodnotna zatim neni

phpGroupWare

http://www.ima.com/
http://www.ima.com/download/free15user.html

http://www.bynari.cz/detail.php3?id_det=7&detail=novinky

SuSE Linux Openexchange Server (viz
http://www.suse.com/us/company/press/press_releases/archive02/openexchange.html
Tedy až bude k dispozici

sdileni kontaktu je mozne pouzit projekt Turba (http://www.horde.org/turba)

http://www.r-goetz.de/minkowsky/en/
Minkowsky is a combination of a calendar, address book, and task
management software. It is a client/server application; all data is
managed on a server and displayed on the client. It was designed to
manage calendars for small-to-mid-sized groups, so it lets you look
into other calendars to check who is available for a meeting. To each
address in the address book, a memo pad is associated to take memos
about phone calls, etc.
Minkowsky send invitation and reminder mails  to all invited participants of
an appointment (if such mails are requested) ....