A few on this list are well known, but quite a few are lesser known, enjoy.
http://www.mangago.me/home/mangalist/355795/
http://www.mangago.me/read-manga/yasashii_ryuu_no_koroshikata/
One of my absolute favorites
If i ever manege to pull myself together and learn japanese, (as i'm doing too on/off to actually learn properly), i'll finish translating it myself ┗( T﹏T )┛
Well.....they are not exactly what you call the best but they are underrated IMO. http://www.mangago.me/home/mangalist/26620/
What are some of the best manga you think are underrated or not talked about enough?