ApexKB

ApexKB is free collaborative search engine script that is powered by social bookmarking. It uses peer and social-networking principles to tag and link distributed content, media, or data to make valuable information more easily discoverable.

Its main features are:
collaborative search engine
collaborative search
enterprise search
search engine
knowledge management
knowledge tagging
enterprise bookmarking
search content, media, data, people, projects, etc
personalized search
specialized search
bookmarking engine
social bookmarking
universal search
community of practice

Listed in Delicious Clone category