Comprendex

Compendex, the computerized version of the Engineering Index, is a comprehensive engineering bibliographical database.

Compendex is an index of engineering materials started in 1884, compiled by hand under the original title of Engineering Index.

Currently it contains over 9 millions records and references over 5000 sources like journals and conferences.

Anually are added 500.000 new records to the database.

Krugle

Krugle is a search engine that allows computer programmers and everyone who wants to look for Open Source repositories in order to locate open source code. Also it allows to  share the code with other programmers on the Internet.

 

It is quite interesting due to the dimension of the Open Source repositories.

Link: www.krugle.com/

Astrophysics Data System

ADS is a database online financiated by the NASA with mora than 5.6 millions of articles of physics, astronomy and astrophysics for example.

It was created on 1992 with a big impact since then on the search of astronomical data.

Link: http://adswww.harvard.edu/

Digital Public Library of America

This Digital Library was launched by the University of Harvard  Berkman Center for Internet & Society in 2010 with the purpose of get in a unique web site the Libray of the Congress of EEUU, the Internet Archive, some academic collections and some other collections.

Link: http://dp.la/

Wikiseek

Wikiseek was a search engine of information. It indexed only articles of Wkipedia and web sites with links to Wikipedia, created by SearchMe Inc.

It has no relation with Wikia or Wikimedia. In January of 2007 it only searched in English.

Open Directory Project

Open Directory Project also known as DMoz is a multilanguage project where volunteer editors linked and categorize links to web sites.

It was founded in 1998.

Link: www.dmoz.org

TEOMA

Teoma was a search engine founded in New Jersey in the University of Rutgers. It is unique in its development and application because of its algorithm of popularity based on links.

It analyzes the links to see the importance of each web site depending on its contents.

It was bought by Ask Jeeves in 2001 and in 2006 it was renombrated and incorpored to ask.com