LogicalDOC is a powerful DMS at the same time effective and easy-to-use. It can mange office documents in most popular formats such as PDF, OpenOffice, Microsoft Office and so on. With LogicalDOC a working group can work on documents with Versioning, Articles on documents, Messaging features and keyword Tags.
"Ekiga (formely known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet.
It supports HD sound quality and video up to DVD size and quality."