Here are some of the old ones that I think are still worth reading today:
Shoujo:
Basara
Akatsuki no Yona
Shounen:
+Anima
Witch Hunter
Tower of God
Kubera
BL:
Doukyuusei
Honto Yajuu
Saezuru Tori wa Habatakanai
Seinen:
Trace
xxxHOLIC
Watashitachi no Shiawase na Jikan
Josei:
Annarasumanara
My Girl (Sahara Mizu)
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