Org mode is described as 'Is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system' and is a very popular todo list manager in the office & productivity category. There are more than 100 alternatives to Org mode for a variety of platforms, including iPhone, Mac, Windows, Android and Web-based apps. The best Org mode alternative is Super Productivity, which is both free and Open Source. Other great apps like Org mode are Zim, Todoist, Tasks.org and TickTick.