Zentyal Server aims at offering small and medium businesses (SMBs) a native drop-in replacement for Windows Small Business Server and Microsoft Exchange Server which can be set up in less than 30 minutes and is both easy to use and affordable.
xtalk is a multi-user IM/chat room system. It can be used to chat with other people within a colourful yet minimalistic command-oriented client.
An Ubuntu-based LAPP appliance that is easy to use and lightweight.
An application for tagging your files and navigating them as a virtual filesystem.