Quick Online Tips: Webpage Monitoring Services : Detects
changeAlarm - Web Site Change Detection
ChangeDetection - Know when any web page changes
Follow That Page - web monitor: we send you an email when your favorite page has changed.
10 Free Services to Monitor Your Site's Uptime
SiteProbe - Website Uptime Monitor, Hourly Status Check
diphur.com | home
10 Free Services to Monitor Your Site's Uptime
30+ Free Web Services & Tools To Monitor Website Downtime
How to Monitor your Website’s Uptime with Google Docs
Versionista: track changes to any Web site
Change detection and notification - Wikipedia, the free encyclopedia
40 Free Web Services & Tools To Monitor Website Downtime | SmashingApps.com