Diccionario de la lengua española dictionary of the Royal Academy: meanings
& etymology
Spanish old dictionaries (18th
century) of the Royal Academy
Clave: Spanish dictionary (meanings)
Vox: meanings in Spanish, synonyms & contraries, Spanish-English dictionary
& catalan, French, German (free limited access)
Wordreference: Spanish meanings
& synonyms & English-Spanish dictionary or Portuguese, French
Larousse: Spanish-English
& French dictionary 
Reverso Collins: Spanish-English dictionary
Collins: Spanish-English dictionary
Wordmagic: Spanish-English dictionary
Webworkbooks: Spanish-English dictionary & grammar
El Mundo: meanings in Spanish, synonyms & contraries, Spanish-English
dictionary (same origin as ya.com)
Diclib: Spanish dictionary
by María Moliner & synonyms
Spanish-English online translation & other languages: texts &
web page
usual expressions Spanish-English
(with sound) (Loecsen)
learn Spanish: usual
& familiar expressions, with sound (bbc)
pictorial vocabulary guide
Diccionario de sinónimos y antónimos:
dictionary of synonyms & antonyms
dictionary of rhyms (rimas)
dictionary of quotes (citas y proverbias) by topics
& authors
English-Spanish &
Spanish-English dictionary by Arturo Cuyas (1962)
Pronouncing dictionary of the Spanish and English languages,
by Mariano Velázquez de la Cadena (1900)
Dictionary of the Spanish and English languages
by Neuman & Baretti, Mateo Seoane (1854)
Spanish and English dictionary by F. C. Meadows (1843)
Spanish idioms with their
English equivalents, by Sarah Becker & Federico Mora (1887)
English and Spanish vocabulary, by topics, by
Fernando de Arteaga (1902)
Technological dictionary in
the English, Spanish, German, and French languages, containing technical terms and locutions employed in arts, trades, and industry in general,
military and naval terms, by Carlos Huelin y Arssu (1906)
Pequeño Larousse ilustrado:
Spanish illustrated Dictionary (1916)
Spanish keyboard to type special characters and punctuation marks
pronunciation of the letters (with sound) > fonética
verb conjugation of Spanish verbs
verb conjugation with Spanish-English translation
Spanish grammar (in Spanish)
Spanish lessons & vocabulary (about)
Spanish course [PDF] (US
Departement of State)
Ortografía
de la lengua española [PDF] spelling & pronunciation, by the Royal Academy
Spanish language (in Spanish)
history of the Spanish language
From Latin to Spanish by Paul Lloyd (1987)
books about Spanish language: Google
books & Internet
archive
Arte Historia: video documentaries (with the text) about history, art,
Spain
Radio nacional de España online
RTVE (Televisión Española)
24h TVE: live online television
Spanish press & international
Cervantès Library online texts & books > catalogue
old books (Google
books)
Don Quixote de la Mancha by Cervantès: text (with sound), translation & documents
bilingual Bible in Spanish, old Spanish & other languages
Todos los seres humanos nacen libres e iguales en dignidad y derechos y,
dotados como están de razón y conciencia, deben comportarse fraternalmente los unos con los otros.
First article in many languages
Declaration of Human Rights: bilingual text in Spanish, Asturian, Catalan & other languages
Spain: maps, symbols, heritage & documents
languages of Spain: Aragonese, Asturian - Galician
- Catalan - Basque