Marshall Kirkpatrick » A Review of Web Site Change Detection Services
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.
Are My Sites Up? - Simple, easy website uptime and downtime monitoring
10 Free Services to Monitor Your Site's Uptime
pingpro website monitoring
Free Website Monitoring and Server Monitoring by BinaryCanary.com
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
Site and Server Monitoring Dashboard - Observu
SiteUptime - Website Monitoring Service
DING IT'S UP! - Website Alerts via Email, Text, and Twitter
How to Monitor your Website’s Uptime with Google Docs
5 Free Tools To Notify You of Website Content Changes
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