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1   Link   Acronyms and Abbreviations
A useful tool for identifying acronyms.
2   Link   Babylon
A program that is advertised as an automatic translator, but like all the others, it leaves much to be desired. The advantage is that by clicking on a word, you open an extensive list of dictionaries (depending on how many and which ones you purchase). The basic license is $99.00, and each dictionary may cost anywhere between $30.00 and $60.00. You may download them onto your computer or use them as online reference materials.
3   Link   Diccionario de términos médicos
A Spanish medical dictionary that displays a map of the different categories in medicine in order to facilitate your search.
4   Link   Sensagent Dictionary
Contains monolingual and bilingual dictionaries in many different languages.
5   Link   Eloihr.net
Contains a useful dictionary of false cognates (false friends), as well as information about software, countries, and languages.
6   Link   European Parliament Terminology Coordination
7   Link   EuroVoc
EuroVoc, the EU's multilingual thesaurus
EuroVoc is a multilingual, multidisciplinary thesaurus covering the activities of the EU, the European Parliament in particular. It contains terms in 23 EU languages (Bulgarian, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hungarian, Italian, Latvian, Lithuanian, Maltese, Polish, Portuguese, Romanian, Slovak, Slovenian, Spanish and Swedish), plus Serbian.
8   Link   IATE
Multilingual terminology dictionary.
9   Link   Linguee
Parallel corpus with several language combinations: SP-EN, SP-FR, SP,GR, SP-PT. It is not 100% reliable, but it is still a good resource.
10   Link   Real Academia de la Lengua Española
Today, the updated website of the Real Academia Española contains more information than ever. Under the “Recursos” tab, you can find various dictionaries, databases, spelling and grammar texts, and online libraries.
11   Link   Regionalisms
Summary of regionalisms in Latin America.
12   Link   Reglas de ortografía
An interesting website that summarizes the latest changes made by the RAE (Real Academia Española). It contains exercises to find out how much you know.
13   Link   Reverso
Spanish-English information technology dictionary. It also contains bilingual dictionaries in several languages, as well as translation, conjugation, grammar, and editing tools.
14   Link   TermiumPlus
Multilingual terminology search engine. The main languages are English and French, but there are also Spanish terms.