Network File System (NFS) allows the HDA to share directories and files with others over a network. You can access files on remote systems like they are local.
OpenNote was built to be an open web-based alternative to Microsoft OneNote® and EverNote®.
Amahi Sync is an app that easily allows you to automatically synchronize, share and back up files online. Once installed, any device can add files.
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.