We use this site in class to do occasional conjugation practice. Use it at home to make up missed exercises or to get extra practice on tenses that still challenge you!
Great comprehensive Spanish/English dictionary with Spanish verb conjugation charts.
Diccionario del Real Academia Española
The "official" Spanish Dictionary
Great link to locate Spanish synonyms.
Link to double check syllabification in Spanish. *Added bonus: It tells you if there are diptongos, triptongos, or hiatos!