BILINGUES
English-Spanish On-line Dictionary
Spanish-English On-line Dictionary
Travlang's Translating Dictionaries
 

ESPAÑOL
Diccionario Anaya de la Lengua
Diccionario de Español (U. de Oviedo)
Diccionario de Regionalismos de la lengua Española
Diccionario de Sinónimos (Univ. de Oviedo)
Diccionario Vox en Línea
Spanish Dictionaries (Varios, incluye bilingues)
 

INGLES
The American Heritage Dictionary of the English Language
Common American Slang
Cambridge International Dictionaries Online
Dictionary.com
An English Homophone Dictionary
The Exploding Dictionary
The LOGOS Pronouncing Dictionary
Merriam-Webster's Collegiate Dictionary
OneLook Dictionaries
Over 1,100 Glossary Links (Compilac. de F. Dietz)
WWWebster Dictionary
XREFER
Your Dictionary.com
 

TESAUROS
Lexical FreeNet (Connected Thesaurus)
Roget’s II: The New Thesaurus
Thesaurus.com
Voycabulary (Online Dict. & Thesaurus)
 

ACRONIMOS Y ABREVIATURAS
Acronym Finder
The WorldWideWeb Acronym and Abbreviation Server
 

SIGNOS Y GESTOS
Encyclopedia of  Western Signs and Ideograms
Handspeak: A Sign Language Dictionary
The Nonverbal Dictionary of Gestures, Signs, and Body Language Cues