Midnight Inbox is described as 'The original Mac GTD application, Midnight Inbox started it all way back in 2005. Inbox is still the only Mac GTD application to include more than just to-do lists and contexts. With Inbox collecting, processing, reviewing, and referencing are taken care of automatically for you' and is a todo list manager in the office & productivity category. There are more than 50 alternatives to Midnight Inbox for a variety of platforms, including iPhone, Mac, iPad, Web-based and Windows apps. The best Midnight Inbox alternative is Remember The Milk, which is free. Other great apps like Midnight Inbox are Org mode, UpNote, Things and OmniFocus.