The Open Directory Project is the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors.
Penrose is a java-based virtual directory server. Virtual directory enables federating (aggregating) identity data from multiple heterogeneous sources like directory, databases, flat files, and web services - real-time - and makes it available to identity consumers via LDAP.
Jigsaw provides an online business directory of company information and more than 10 million business contacts. If your success depends on reaching out to others, Jigsaw is essential. And that's why over 500 corporations and more than 600,000 members turn to Jigsaw.
Every contact in Jigsaw is complete with full name, title, postal address, hard-to-find email address and telephone number.
Launched in January 2006, ScienceBlogs is a portal to this global dialogue, a digital science salon featuring the leading bloggers from a wide array of scientific disciplines. Today, ScienceBlogs is the largest online community dedicated to science.
I. Zaihrayeu, L. Sun, F. Giunchiglia, W. Pan, Q. Ju, M. Chi, and X. Huang. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 617--630. Berlin, Heidelberg, Springer Verlag, (November 2007)