ManicTime is described as 'Automatically records your computer usage. It remembers which apps you've used and for how long. It will also remember which web sites you've visited and which documents you've worked on' and is a very popular Time Tracking tool in the office & productivity category. There are more than 100 alternatives to ManicTime for a variety of platforms, including Windows, Mac, Web-based, iPhone and Linux apps. The best ManicTime alternative is ActivityWatch, which is both free and Open Source. Other great apps like ManicTime are Toggl Track, TimeScribe, RescueTime and Clockify.