One of the largest English speaking hentai websites in the world!
Stuff is getting uploaded by administrators as well as by users. There is free stuff available, but also hentais where you need a subscription.
You get new stuff on the index site and you can crawl for more Manga and Doujinshi from the top menu.
They have a huge user base and if you want to get in touch with other hentai lovers, we can highly recommend their forum, which is very active.
F! is a must see.