CollinsDictionary.com contains tables for 5,000 Spanish verbs. The site features a search function that lets the user search for a verb's infinitive form, and also includes links to the 50 most popular verb tables.
The tables demonstrate how to conjugate verbs in a number of ways. As well as the present indicative form, the tables include more advanced forms such as the future perfect and the present perfect subjunctive.
CollinsDictionary.com also includes an English-Spanish dictionary so the user can translate any verbs from English to Spanish before searching the tables.
For further practice, StudySpanish.com lets the user create his own verb conjugation quizzes. Study Spanish recommends reading all of the sentences out loud so the student can incorporate the new verb forms into his speech.