* Download katte-version 8 (katte-versions are forks based from official version 7)
* Download music for katte-version 8
* Download RPG Maker 2k RTP (required to run RyonaRPG)
* General repository.
* Wiki guide/walkthrough
Recently this game came to my attention. It's made by a bunch of people collaboratively on a 2chan-style Japanese message board. It features many heroines of various games (Final Fantasy series, SaGa series, and others), as well as some original characters.
It's a constant work of progress, and different characters are at different levels of completion (and quality). My current favorite is Nakoruru from Samurai Shodown series
Others with a decent number of images include Monica from Romancing SaGa 3, Riesz from Seiken Densetsu 3 (aka "Secret of Mana 2"), and Lena from Final Fantasy 5.
The game involves you controlling the heroine you picked, and run around various maps doing quests or just exploring/discovering dungeons. Battles are fought in real-time on the map, classic Zelda style, though character stats and abilities are typical RPG form.
There are a number of bad things that can happen to your heroine if you aren't very careful...
Heck, during character selection, you even get to customize the girl's sensitivity in different parts of her body.
I'm right now doing using a wiki to help me keep notes on various aspects of the game, at http://scratchpad.wikia.com/wiki/RyonaRPG