Optimot

http://www.gencat.cat/optimot/

Linguistic consulting in catalan

Royal Spanish Academy Dictionary

http://www.rae.es/rae.html

APTIC

http://www.aptic.cat/

Association of Professional Translators and Interpreters of Catalonia.
Ideas Generator

Diccionario de Ideas afines

http://www.ideasafines.com.ar/

Fax on-line

http://www.myfax.com/

Wordreference Dictionaries

http://www.wordreference.com

Multilingual, synonym dictionaries...

Wordreference Dictionaries

http://www.wordreference.com

Multilingual, synonym dictionaries...

Reverso Multilingual Dictionary

http://diccionario.reverso.net/

Free software for translators

http://traduccionymundolibre.com/?page_id=16

Medical Terminology Dictionary

http://www.iqb.es/diccio/a.htm

Catalan Enciclopedia Dictionary

http://www.diccionari.cat/lexicx.jsp?GECART=0