Absent Brain
Web site monitoring supporting group notifications, multiple source locations, and WAP-enabled status checking.

AccessibilityWatch
Tests the accessibility of entire web site on a weekly schedule. Monitors compliance with Section 508 Standards, W3C WCAG 1.0 Priority 1-3 Guidelines, and/or IBM Accessibility Guidelines. Email alerts and web-based reporting.

ACNielsen dMeasure
External website performance monitoring and competitor benchmarking from test locations in Australia, Asia and US. Escalating alerts with a wide variety of alert methods.

AlarmTILT
Unified incident handling solution alerting via SMS, e-mail, voice alerts, and pagers.

AlertBot
Web site monitoring service that tests website availability, performance, and alerts webmaster of downtime. Also provides ftp, http, pop3, snmp, https, smtp, ip, and dns server monitoring.

AlertMeFirst.com
Remote website and network performance monitoring service that will email or page you if your internet device or software is down or slow to respond.

Alertra
Remote web site monitoring and failure notification from global network, supports http, https, ping, smtp, pop3, imap4, ftp and tcp-level checks.

AlertSite
Monitors the availability and performance of web sites and internet services as often as every minute from multiple geographic locations. Alerts via email, pager, SMS, cell.

At Watch
Watches your web site 24 hours a day, 7 days a week. It will send immediate alerts via email/pager, fax, or live voice if your site is down or broken.

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