Gran Diccionari de la Llengua Catalana - Online monolingual dictionary of Catalan, very comprehensive in size and scope; this is the main dictionary for the Catalan language, with 83,500 entries, over 20,000 sub-entries and 164,500 definitions.
DACCO Catalan-English Dictionary - Online bilingual Catalan-English dictionary (Diccionari Anglès-Català de Codi Obert) with English-Catalan: 10,028 entries, 13,607 translations, 538 examples, 845 usage notes; Catalan-English: 7,561 entries, 8,586 translations, 776 examples, 171 usage notes. There are also downloadable PDF versions of the dictionary available, and an English language version of the site.
diccionaris.cat Catalan-English-French Dictionarya - Translations to and from Catalan, English, and French
Lexicool Catalan-English Dictionary - Searchable translation of words and phrases.
Diccionarios.com Multilingual Dictionary - Online multilingual dictionary for Catalan, English, French, and Spanish.
Dict.info Catalan-English Dictionary - Small HTML dictionary of English words with Catalan equivalents.
Dict.info English-Catalan Dictionary - Small HTML dictionary of Catalan words with English equivalents.
Dict.info Catalan-Danish Dictionary - Small HTML dictionary of Catalan words and their Danish equivalents.
Greek-Catalan Dictionary - Online HTML dictionary of Greek terms and their translations into Catalan.
Icelandic-Catalan Dictionary - HTML dictionary of Icelandic words and their translations into Catalan.
Diccionari Enciclopèdic de Medicina - Online Catalan dictionary of medicine; gives the meanings for medical terms in Catalan, English, and Spanish, with definitions and explanations in Catalan.
Verbix Catalan Verb Conjugator - Verb conjugation engine for Catalan.
Descriptive Grammar of the Catalan Language - Materials for the page provided by Alberto Jose Miyara, Jordi Floriach i Ytxart and Michele Brunelli.