Anime Database

AniDB.net
This site is for those who love anime and want to keep a list of anime that you watched, It is so easy that all you have to do is select all your anime files on your PC with the web base software that they provide you don't need to download it but you need to register at there site and its free too and they contain all the anime that have been released "i think", At first you might may get confused about how to navigate through the site but you will get around, And u can browse anime so easily you just have to do is select the category of the anime you wont to find, you can select more then one and search, when the result shows up you can sort it by rating, episodes, anime type ect...
when you open a anime result that page contain how many episodes, who have release it like fan sub, what are the quality's of that episode that have been release by various fan subs like video resolution, video quality ect..
The bad thing is that they don't provide direct download links or what ever link to a file but you can find out who have release that file and go to their page by searching their name on Google or most of the time you can find it on the AniDB site even if you cant find it that way then there is another way open a anime file details by clicking on the "Show file details" button near the file and click it and you will get a page like this File: Ao no Exorcist - 1 there are fields with numbers like CRC, ED2K ect.. copy those numbers and search it on Google and you will go to the exact file and then you can download it :)