Wikimedia
Wikipedia: Constitutional Monarchy
A definition of what a constitutional monarchy is. Gives some historical background to the development of a constitutional monarchy and current examples from around the world.
Other
Percentage of the World's Population Under Various Political Systems
Time-line graphs and maps give visual representations of countries and populations under various kinds of political systems: autocracy, monarchy, communist state, etc.
Other
Stutz Family: World Affairs: Types of Governments
A chart of influences that lead to what type of government is established. At least two of these: economy, politics and authority, are present in all systems.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Democracy?
Explains what democracy is, its characteristics, the different forms it can take, and some history of this type of government.
Mocomi & Anibrain Digital Technologies
Mocomi: Types of Government
Explains the characteristics of seven different types of government. Includes a group activity.
Other
Nation States: New Nation
This is a nation simulation game. Create a nation according to your political ideals and care for its people.