From IFWiki

This category should list topics that are related to Infocom, a notable U.S. publisher of IF games in the 1980s. Topics may include people who worked for Infocom, games published under the Infocom title, programming tools developed by Infocom, articles about Infocom, and so on.

However, note that topics and articles about the fictional world known as Zork should instead be listed under Category:Zork.