This software for Mac OS X was originally designed by All-Seeing Interactive. The application lies within Internet & Network Tools, more precisely General.
From the developer:
Tool for visual thinking, group working and content management. It allows users to create visual maps of information using web-like structures. Documents from any application can be imported into a space, and the software's built in version control allows users to keep track of earlier versions of documents easily. Relationships between elements can be described using visual links.
You may want to check out more software for Mac, such as RMS sharing, Shared Menus Enhancer or Space-In-Time, which might be related to Shared Space.
File Managers
Document management