The first version of Neko I was aware of was on the Apple Macintosh as a desktop accessory,but since then the code has been modified and re-written by various people so that Neko can play on a variety of different machines.
I use Neko as a way of trying out dev tools an new platforms. So here is a variation on Neko for Android. Download here
Download Neko from Ninelocks.com
The history of Neko (as far as I am aware is)
neko DA (Macintosh version) © 1989 by Kenji Gotoh
xneko (X11 version) ©1990 by Masayuki Koba
Pilot version ©1997 by Hoshi Takanori
(If I have missed someone out, please let me know.)
This is an update of the version (with multiple cats) that I wrote for PalmOS and later Windows Mobile devices.