Qustodio is a parental control application that helps parents watch over and monitor the web pages that their children are visiting throughout the day. It also helps restrict certain types of content.
The program allows you to monitor the amount of time your kids spend on the computer, up to the exact times they start and stop using the computer. Also, it gives you the option of restricting certain content with just a click of the mouse. For example, you can prevent them from opening up web pages related to religion, or program the application to send you a notification every time your child visits those pages.
The best of all is that you can watch your kids from anywhere, since the only thing you need is a steady Internet connection and to have the Qustodio program opened.
Qustodio is an useful tool for monitoring your kids' habits on the computer, although spying on all the content they look at on the Internet might be a bit excessive.