Profit - A clone of the board game Acquire.

Warzone2100 an open source RTS game being ported to Qt.

Minesweeper in Python - A PyQt version of the popular logic game.

It provides a fairly rich interface for setting up and playing such games.

QBoard - A Qt 4.3/4.4 application for playing near-arbitrary board games.

Uses Box2D for physics simulation, GPC for polygon manipulation and Qt for everything else. It allows you to build and control machine in 2D physical world.

Construqtor - This is educational toy.

PiperWar - non commercial RPG-like game on 'paper' with Box2d engine, uses OpenGL (LGPL).

Bubble-chains - Arcade-puzzle game for Windows, Linux.

JAG - An arcade-puzzle 2D game which runs on Linux and Windows.

But it use Qt in front-end screen and multiplay lobby screen.

Hedgewars - Free Worms-like turn based strategy game.

But it seems that in-game graphics are drawn by SDL.

Attal : Lords of doom - A themeable turn-based strategy game.

GNUDoQ - An open source, graphical Su Doku generator and solver with printer support.

Originally written for a course at Hasselt University in Belgium. Includes build+packaging scripts for Windows, Mac OS X and Linux.

Sudoku - Fancy, feature-complete, cross-platform Sudoku app written in C+ /Qt.

qt-nethack - A one of GUI frontend of Nethack, famous rogue-like game.

For mac instal Rogue Lords