Yume Nikki (2004-2007) is a game made with RPG Maker 2003 by Kikiyama. It consists in exploring a dream world and collecting effects, having no story or dialogue.
Official
Kikiyama's site
Vector.co.jp
Dream Diary
Manga
Novel
Interview with Kikiyama by Toby Fox
Older versions
Fan material
Yume Nikki Online Project
Wiki
Uboachan
Gobou
Madotsuki's Closet
Most famous fangames
Yume 2kki
.flow
Other
REX Yume Nikki (1993)
Ancient Paracas Poncho with "Madotsuki"
art by Pogney