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, Web-based, Windows and Android apps. The best Org mode alternative is Super Productivity, which is both free and Open Source. Other great apps like Org mode are Notion, Zim, Todoist and TickTick.