"Many Games" is a system for creating and running a nearly endless
number of user-defined (or downloaded) games in a graphical
system. It will support games, such as checkers, tetris, solitaire,
breakout, and almost any other two dimensional game.
Thousand Parsec is a framework for turn based 4 X's game (eXplore, eXpand, eXploit, eXterminate). Designed for long games, supporting massive universes and has an easily expanded tech tree.