Internet Encyclopedia of Philosophy. Articles in this encyclopedia are currently from three sources: (i) adaptations from public domain sources, (ii) adaptations of material written by the editor, Dr. James Fieser, for classroom purposes, and (iii) original contributions by professional philosophers around the internet.

Encyclopedias and Similar Works of Reference. This is a webpage maintained by Otfried Lieberknecht. Early encyclopaedias and modern resources are listed.

Dictionaries and Wordlists. This is another webpage maintained by Otfried Lieberknecht, in which he provides lots of links to online dictionaries in Greek, Latin, Italian, French, Spanish, Portuguese, English, German, etc.

Your Dictionary.com. This site was founded in 1999 to provide the world's most comprehensive, and authoritative portal for language, and language-related products and services on the world wide web. They claim to have the widest and deepest set of dictionaries on the web (more than 1500 dictionaries representing more than 230 languages).

I Love Languages. This is a comprehensive catalog of language-related Internet resources. The more than 2000 links at this site have been hand-reviewed to bring you the best language links the Web has to offer. According to their 'About' link, "Whether you're looking for online language lessons, translating dictionaries, native literature, translation services, software, language schools, or just a little information on a language you've heard about, iLoveLanguages probably has something to suit your needs".

Diccionario de la RAE. Desde sus orígenes, la Real Academia Española ha dedicado la mayor parte de sus esfuerzos a "velar por que los cambios que experimente la Lengua Española en su constante adaptación a las necesidades de sus hablantes no quiebren la esencial unidad que mantiene en todo el ámbito hispánico". Esta tarea se ha llevado a cabo tradicionalmente mediante la elaboración de Diccionarios y obras afines.

Dictionary of Science and Technology. Harcourt and Academic Press have brought one of the largest scientific dictionary ever compiled in the English language to the Web. You can search from over 130,000 terms defined in 130 fields of science.