This data hase been merged into the glossary and games by equipment. I'm leaving all this here if anyone wants to move more over. All of the active content is there except CnC, which I believe better fits under game series. The rest aren't links yet and can be added when someone makes the content.
A Game System is a set of components and/or rules that are intended to be used to create games.
War Game Systems
(Placeholder for someone more knowledgeable than I am.)
Columbia Block Games?