We do a lot of work building portals and intranets that provide collaborative online spaces for professional communities. Some of these projects are completely private sites, and some are open to larger user groups. In each case we need to provide a toolset that could be configured differently for each site and frequently tweaked in particular groups. To do this we've built Spaces. It's a module that leverages Organic Groups to relate users and content to groups, and it extends context_ui to define 'features' that can be control individually in each group.  Spaces also makes assumptions about how you want groups to work and so is able to reduce the options available when creating groups and posts in groups, making the group creation and content posting processes more intuitive.

To get a sense of how this module works I have taken two screen shots from our own intranet package that we call 8trees. Here you are looking at our own team space on the 8trees install that we run for ourselves to communicate with our clients.  It provided us with a terrific way to test code and ideas on a captive and critical (but forgiving) audience. Clients never know there is anything but their own little space, but we move quickly and easily between them and have different tools (blog/book/casetrack/calander) turned on for different clients depending what stage the project is in. This is what spaces lets us do.