This website is a link for verb conjugations, like the 501 Verbs book:
Spanish dictionary and translator:
http://www.spanishdict.com/
Everything about nouns and gender/number:
http://www.orbilat.com/Languages/Spanish/Grammar/Spanish-Noun.html
Lots of cognate help:
http://www.esdict.com/English-Spanish-Cognates.html#nouns
Words ending in erĂa:
http://www.braser.com/spanish-learning/spanish-words-eria.html
list of ar verbs:
http://www.rcaguilar.com/spanish/verbs/listas/master-ar-regular.htm
list of er verbs:
http://www.intro2spanish.com/verbs/listas/master-er-regular.htm
list of ir verbs:
http://www.intro2spanish.com/verbs/listas/master-ir-regular.htm
List of common adjectives:
http://www.braser.com/swhelp/hs295.htm