The Rumor Categorizer Software (RCS), an open-source software, categorizes Twitter posts based on their stance towards a given rumor into six categories; rumor tweet, anti-rumor tweet, rumor retweet, anti-rumor retweet, rumor-related tweet, and rumor-related retweet. Then for the publishers of those tweets/retweets, analyze the user dynamics. Furthermore, the software calculates the number of users belonging to any combination of the sextuple categories and plots the number of tweets/retweets in each hour for rumor and anti-rumor. The software aids researchers and practitioners in analyzing rumors effectively.