urlwatch is described as 'is intended to help you watch changes in webpages and get notified (via e-mail, in your terminal or through various third party services) of any changes. The change notification will include the URL that has changed and a unified diff of what has changed' and is an app in the OS & Utilities category. There are more than 10 alternatives to urlwatch for a variety of platforms, including Online / Web-based, Windows, Linux, Firefox and Google Chrome. The best alternative is Distill Web Monitor, which is free. Other great apps like urlwatch are Update Scanner (Free, Open Source), WebSite-Watcher (Paid), Wachete (Freemium) and Follow That Page (Freemium).