I'm going to trim this list down as I tried the trials to a few of the games and it turns out they have GxG elements which negates them as strictly GxB. (If I wanted GxG I'd look to Ren'ai and the TON of other games out there.)
So Fatal Hearts and Reileen get dropped.
For Doujin Works, I'm going to list completed games that have a certain professional caliber to them. Most of the ones I see on RenPy are short, or there was little consideration to art. I haven't played all of them out there, so there might be a few I've personally missed.
NTT Solmare: Shall We Date?:
My Sweet Prince
Actor to Be
"KONKATSU" for Marriage
Pirates In Love
MoteMote - Love Story for Girls
My Forged Wedding (iOS)
Seduced in the Sleepless City (iOS)
KEITAI ☆ Guardian
London Detective Story
Road To Emerald