Akabeisoft2
August (August Association)
Cauliflower
circus
handcuffs
etude
Feng (surname)
billion
Pure gray
child
Konami
Tang Huagong
Yezi (Yezishe)
sweetheart
Minori
Makula pillow club
Sodium nitroprusside/nitro+(the old virtual society was just Gen Urobuchi N+)
Track root
0verflow (traffic during the whole school period)
pallette
Stage nana
E.go studio! (Yamamoto didn't write a new work after he left, and Yamamoto and his party founded another society, Debon Su)
Type-Moon (Moon Club, Destiny, Moon Ji, etc.)
will
Most people know this, and there are many others. チャンピオンソフト(Champion Software Company is a subsidiary of ALICESOFT.
How many are hard to count? These are famous.
I won't talk about some famous adult games.