Rule is described as 'For teams that have things to talk about and things to do, Rule (www.rule.fm) is the cloud application that connects discussions to activity. Unlike other productivity solutions, Rule gives even the smallest work item a proper place and it's own space for sharing, connecting' and is a project management tool in the office & productivity category. There are more than 50 alternatives to Rule for a variety of platforms, including Web-based, Windows, iPhone, Mac and Android apps. The best Rule alternative is ONLYOFFICE, which is both free and Open Source. Other great apps like Rule are Trello, Redmine, Basecamp and Wrike.