Logos
Logos bills itself as the largest freely accessible multilingual dictionary This English-Hindi/Hindi-English dictionary translates words from both languages instantly, and allows the user to type in just part of a word to find all possible matches. The site also features a picture dictionary.
http://www.logos.it/

Dicts
On this Internet site, you can find a free online bilingual dictionary that allows you to translate Hindi words into English.
http://dicts.info/2/english-hindi.php

Freelang
On the Freelang site, you will find a free translation dictionary from Hindi (romanized) to English, which you can consult online or download.
http://www.freelang.net/online/hindi.php

Ectaco
This site offers instant translations of Hindi and English words. This free Hindi-English dictionary contains 400,000 words.
http://www.ectaco.co.uk/English-Hindi-Dictionary/