gnizr is an open source application for social bookmarking and web mashup. It is easy to use gnizr to create a personalized del.icio.us-like portal for a group of friends and colleagues to store, classify and share information, and to mash-it-up with information about location.
Image Matters LLC contributed gnizr to the Open Source community, and continues to support its development as part of its gnizr Enterprise software.