Copernic Tracker is described as 'automatically looks for new content on Web pages, as often as you like. When a change is detected, our Web site tracking software can notify you by sending an email, including a copy of the Web page with the changes highlighted, or by displaying a desktop alert' and is an app in the OS & Utilities category. There are more than 10 alternatives to Copernic Tracker for a variety of platforms, including Online / Web-based, Windows, Firefox, Linux and Android. The best alternative is UptimeRobot, which is free. Other great apps like Copernic Tracker are Google Alerts (Free), Update Scanner (Free, Open Source), Feedfry (Freemium) and Wachete (Freemium).
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(S), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
Versionista is an online service that alerts you when a Web site changes. It shows you what's been added & removed to any Web page. It records a full page screenshot, and lets you use powerful inclusion/exclusion filters.