Sankaku Channel is all about crazy hentai images.
It is very popular in Japan and Asia (but also US) so it has the tentacles and all the crazy shit but it has its own positive vibe.
The design of the website is a bit strange but they do have a beta version coming up soon so things might be improving.
The content is pretty much completely free - you only need an account if you want to comment, but other than that, you can just download pretty much everything.
On the not so great side, they do have a lot of ads and sometimes you get redirected to other websites without warning.
But overall - crazy good hentai resource
8 out of 10