Universidad de Oviedo - Diccionario de Inglés - Español
- English to Spanish (only) interface linked to Webster's for English definitions and a good Spanish dictionary for definitions
- http://tradu.scig.uniovi.es/trad.html

Travlang's English-Spanish Dictionary
- A searchable dictionary which gives translations between English and Spanish words.
- http://dictionaries.travlang.com/EnglishSpanish/

Tomísimo - Spanish and English Dictionary
- Provides two-way searches, organizing results by relevancy. Allows wildcards. Accepts new words and phrases into the growing corpus of over 11,000 translations.
- http://www.tomisimo.org

SpanishHabitat's English to Spanish dictionary
- Browseable and searchable English to Spanish dictionary.
- http://www.spanishhabitat.com/learn-spanish/

Online English to Spanish to English Dictionary
- Search for word translations between English and Spanish. Approximately 20,000 terms in each language.
- http://www.freedict.com/onldict/spa.html

LookWAYup English to Spanish Dictionary
- Bidirectional English to Spanish dictionary, with definitions and thesaurus. Corrects spelling including accents.
- http://lookwayup.com/free/EnglishSpanishDictionary.htm

IFCC - Diccionario inglés-español de Ciencias de Laboratorio Clínico
- Clinical Laboratory Sciences. English-spanish dictionary. Impressive bibliography and list of participant authorities. Downloadable in different versions: ASCII text, Windows, Word Perfect.
- http://www.leeds.ac.uk/ifcc/PD/dict/spandict.html

Glossary-guide for Translating Husserl
- Multilingual, a guide for translating works by Edmund Husserl, into Spanish.
- http://www.filosoficas.unam.mx/~gth/gthii.htm

English-Spanish Word List of Common Computing Terms
- Very few basic words.
- http://www.css.qmul.ac.uk/foreign/eng-spanish.htm

Comparative CyberLexicon - Ciber-Léxico Comparativo
- Compilation of English terminology peculiar to computer culture and technology and its equivalents in Spanish. Eng-Spa-Eng
- http://www.telefonica.es/fat/elex.html

Spanish Dictionary
- Bidirectional Spanish and English dictionary with audio pronunciation of the words.
- http://spanishdict.com/

Technical English - Spanish Vocabulary
- A technical vocabulary useful in helping the students, technicians and engineers to overcome the difficulties of translating from English into Spanish.
- http://www.sapiensman.com/ESDictionary/index.htm

Geology and Mining Technical Terms
- Glossary of geology, mineral surveys, and mining engineering from English to Spanish.
- http://www.ex.ac.uk/CSM/documents/glossary_spanish.htm

Business English Spanish Glossary
- Bilingual site, with bidirectional translations of 8,000 business-related terms.
- http://www.ctv.es/USERS/amiles/glossaryhome.htm

Online Spanish Thesaurus
- Thesaurus with spell checker and verb conjugations.
- http://www.lenguaje.com/english/herramientas/tesauro/default.htm

Diccionarios.com
- Bidirectional translations between Spanish and: English, French, German, and Catalan. Requires cookies, JavaScript, and a 4.0 or later browser.
- http://www.diccionarios.com/

Directory of Spanish English, English Spanish dictionaries
- List of Spanish-English, English-Spanish dictionaries and translators on the web by an experienced native professor and useful Spanish links.
- http://www.spanishnewyork.com/spanish-translators-spanish-dicctionaries-on-line.html#Directory of Spanish English Dictionaries on the Web

IFLA Glossary
- English-Spanish database of terminology used by the International Federation of Library Associations and Institutions (IFLA)
- http://eubd1.ugr.es/tony/risweb.isa/

COES: Herramienta Lingüística de Libre Distribución para la Lengua Española
- Set of data files that implements a Spanish (castellano) dictionary with 52,000 roots (approx.) and their derivated forms. Includes Spanish spelling dictionary. Based on Unix tool ispell. Distributed under GNU "General Public License of the Free Soft
- http://www.datsi.fi.upm.es/~coes/espell_readme/espell_readme.html

Spanish Macintosh-only dictionaries and lessons
- Downloadable programs, shareware. Spanish nouns, English Spanish dictionary, German Spanish. Also includes many other languages.
- http://users.netmatters.co.uk/dandaforbes/Spanish.html