ownCloud provides universal access to files via a browser or WebDAV. Easily view and sync your contacts, calendars and bookmarks across all your devices and enables basic editing.
Wacko Wiki is a light and handy Wiki-engine.
Zenphoto is a standalone gallery CMS that just makes sense and doesn't try to do everything and your dishes.
Omeka is a free, flexible, and open source web-publishing platform for the display of library, museum, archives, and scholarly collections and exhibitions.
Piwigo is a photo gallery software for the web that comes with powerful features to publish and manage your collection of pictures.
Calendar application that can be configured as single, multi-user calendar, or as an event calendar viewable by visitors.