Here you can find all the anime episodes released so far for the anime series: To Aru Majutsu no Index.
The anime episodes for To Aru Majutsu no Index are available for download via torrent or direct download.

Synopsis:

Set in a city of scientifically advanced superhuman students, but in a world where magic is also real. Toma Kamijo’s right hand, the Imagine Breaker, will negate all magic, psychic, or divine powers, but not his own bad luck. One day he finds a young girl hanging on his balcony railing. She turns out to be a nun from the Church of England, and her mind has been implanted with the Index-Librorum-Prohibitorum – all the magical texts the Church has removed from circulation.