Sometimes I come across software that is just cool. Leaves what you are used to in the dust, and makes you switch to it. From AfterStep to KDE, Mac OS 9 to OS X, PageMaker to Quark Xpress - and then to InDesign, even Windows 95 - but beating Windows 3 was not that hard.

Feng Office (formerly OpenGoo) joins that list. The problem with OpenGoo is trying to describe what it is. The developers say their aim is to "make the best web office. Period", but then go on to ask what a web office is. It is a question they still have not answered.

OpenGoo, also avialable as Feng Office, provides flexible Workspaces that can be shared with staff, customers and other collaborators. Workspace can be created for Customers, Projects, Departments, and so on. Workspaces can also be created inside other workspaces - so you could create a Project workspace that is shared with clients and other external team members, and a Project Administration workspace within the project workspace that is only visible to your staff or selected members of the team.

Feng Office has Notes, Email, Contacts, Calenders, a Document Store, Tasks, Time Tracking, Web Links, etc, and items can be added to one or more Workspace.

Items can be color coded, tagged, linked to other items, assigned to users, searched and filtered.

All this makes a flexible system for collaboration, where new ways of using it are still being discovered. For smaller organisations without rigid job descriptions, who don't need the advanced features of, say, SugarCRM, Feng Office would be a good choice.