40 Free Web Services & Tools To Monitor Website Downtime | SmashingApps.com
Change detection and notification - Wikipedia, the free encyclopedia
Versionista: track changes to any Web site
5 Free Tools To Notify You of Website Content Changes
How to Monitor your Website’s Uptime with Google Docs
DING IT'S UP! - Website Alerts via Email, Text, and Twitter
SiteUptime - Website Monitoring Service
Site and Server Monitoring Dashboard - Observu
30+ Free Web Services & Tools To Monitor Website Downtime
10 Free Services to Monitor Your Site's Uptime
diphur.com | home
SiteProbe - Website Uptime Monitor, Hourly Status Check
Free Website Monitoring and Server Monitoring by BinaryCanary.com
pingpro website monitoring
10 Free Services to Monitor Your Site's Uptime
Are My Sites Up? - Simple, easy website uptime and downtime monitoring
Follow That Page - web monitor: we send you an email when your favorite page has changed.
ChangeDetection - Know when any web page changes
changeAlarm - Web Site Change Detection
Marshall Kirkpatrick » A Review of Web Site Change Detection Services