NullpoMino

NullpoMino
Developer(s)	Anonymous, Zircean
Publisher(s)	N/A
Platform(s)	Java
Release	2007?
Gameplay info
Next pieces	variable
Playfield size	variable
Hold piece	Yes, with IHS
Hard drop	Yes
Rotation system	Almost anything you can come up with

NullpoMino is a cross-platform, open-source Tetris clone written in LWJGL (Lightweight Java Games Library). It simulates a great many games, including the TGM series, and contains a utility for creating your own custom rotation systems as well.