These software products and applications can help parents block certain websites to help their child stay on task when completing homework on the computer. These products can also be very helpful for adults with ADHD.
Surfblocker – With Surfblocker you can easily restrict internet access at specified times or on demand. It allows you to block websites and to limit which programs and features have access to the internet. For example, you can set Surfblocker to allow access to your email and work or study related websites only. You can also password protect the internet connection and set it to unblock after a specificed amount of time. Worth checking out.
StayFocused – this app is for Google Chrome users only. StayFocused is a productivity extension for Google Chrome that helps you to stay focused on work or school. It restricts the amount of time you can spend on time-wasting websites. Once your allotted time has been used up, the sites you have blocked will be inaccessible for the rest of the day. It is very configurable, and allows you to block or allow entire sites, specific subdomains, specific paths, specific pages, even specific in-page content (videos, games, images, forms, etc).
LeechBlock – this extension is for Firefox users. This extension is designed to block websites and allows you to specify when you want them blocked. LeechBlock has noted that it is not designed for parental control or for blocking offensive content.