Broadly defined, "a serious game or applied game is a game designed for a primary purpose other than pure entertainment. The "serious" adjective is generally prepended to refer to video games used by industries like defense, education, scientific exploration, health care, emergency management, city planning, engineering, and politics. The idea shares aspects with simulation generally, including flight simulation and medical simulation, but explicitly emphasizes the added pedagogical value of fun and competition."
If educating people through the use of games interests you, this list of projects might give you ideas for your own projects:
If games in health studies interests you, this list of projects might give you ideas for your own projects:
If using games to augment military training interests you, this list of projects might give you ideas for your own projects: