Saved my life countless times

www.freetranslation.com

I probably have more goodwill towards this site than any other. I won't lie that I am horrible in Spanish and use online translators a lot. This one is the best in my opinion. What sets it apart are the dropdown menus for adding accents. I don't know the hotkeys and that usability feature is very helpful. Also, it doesn't translate word for word like most other sites. It will reorganize the grammar so the translation actually makes sense.