I use online resources frequently.
I do tell the students not to use online translators, but I tell them that there is a difference between using translators for full sentences and paragraphs and using a translator or dictionary site to find a word or conjugation.
Here are some of my favorite online resources for Spanish verbs:
Language Guide: Clearly see conjugations and LISTEN to the correct pronunciation.
Spanish Verb Forms: My favorite list of verbs & conjugations
Spanish Verb Conjugations: Nicely arranged
Reflexive Verbs: Nice long list
Learn Spanish Today: Conjugations plus list of verbs
Let me know what your favorite verb resources are !