YomoYomo
This site changes the kanji of any website to hiragana/romaji.You can also hear the pronunciation of words.
Adaptive Technology
This site changes the kanji of any website to hiragana/katakana/romaji.Registration is required (Free)
AddRuby
This site changes the kanji of any website to hiragana/katakana/romaji.The font size for the romaji is a little small.