The Floranta libraries provide components for building Rich Client Wikis using AJAX or Java. Floranta clients can be embedded in any webpage (even plain html) and allow users to leave notes, images, cards, etc on the pages. Eg: http://www.floranta.com
Narya is a forum/incubator software, based on a Python/Zope/MySQL platform. Emphasis on graphics support and collaboration for space and technology development. Compare PHP/MySQL forums.
phpGuestbook is a guestbook application written in PHP which provides text formatting, smilies, templates and an administration interface. It uses the PEAR::DB interface to connect to various databases and it is os independent.
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This program hopes to become a viable MS Sharepoint clone. It is basically a web interface to a document repository (Frontpage Web), but with many other features...It depends on Frontpage for remote authoring, otherwise it is independent.