The premier application for conjugating Spanish verbs, ProConjugate Spanish contains over 4100 verbs.
Spanish Tester Pro
Spanish Tester Pro quizzes you adaptively with millions of questions to improve your conjugations and part-of-speech agreement.
4001 Spanish Verbs
4001 Spanish verbs lets you quickly look up over 4100 Spanish verb conjugations in 15 forms.
ProConjugate French contains over 650 verbs in 15 forms and shows placement of objects, reflexives and negatives.