| Nexus Watch 
Monitors availability and performance of web sites, dns, and ftp, including web content checking. |
| PingALink 
PingALink monitors each of your servers 12 times an hour, 24/7, and alerts you to their status by email, pager, cell phone, PDA or ICQ. |
| Red Alert 
Subscription monitoring service. |
| Right Stats 
Offering free site stats and free 500 URL submissions to top search engines. |
| ServerHawk.Com 
Remotely monitors your web site and immediately notifies you when your web site is down. |
| Site Guardian 
Customized monitoring solutions to ensure your site is up and functioning properly 24 hours a day, seven days a week. |
| SiteAlarm 
Monitor your site in intervals from 1-30 minutes. HTTP-check, content check and defacement check. Advanced statictics options. Alert via e-mail and SMS. 14 days free trial. |
| SiteMonitors 
Web site availability and performance monitoring. Provides automated alerts, graphs, and daily/weekly reports via email. |
| SiteProbe 
Tool that checks the status of your website hourly. Free limited option available. |
| SiteRecon 
Independent 24/7/365 web site monitoring, notification, and performance verification of mission critical HTTP, HTTPS, FTP, and SMTP servers. Free web site security tools to assist in keeping your site operational. |
| SiteSeer 
Monitors various internet services including web, mail, DNS, and SQL databases. URL monitoring from multiple global backbones. Free 10-day trial. |
| SiteUptime 
Free website monitoring services. Receive instant email notices when your website becomes unavailable. Provides detailed web based statistics and performance reports. |
| TraceRT 
Online interface to trigger ping and traceroute tests from more than 200 locations all over the world. |
| URL Monitor 
A facility to constantly monitor your web site and inform you if there is a problem. Both free and premium accounts available. |
| Uptime 
Free website monitoring service based on retrieving a short text file. E-mail and/or pager notification. With an overall list of monitored sites and their status. |
| Vertain 
Monitor web sites, multi-page web transactions, and audio/video content. Some free services available. |
| Watch4you 
Offers server monitoring with SMS notification. Covers web, mail, and DNS protocols. |
| 1stMonitor 
Web site monitoring notifies you via email when a web site is down or new content has been posted. |
| 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. |
| 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. |
| 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. |
| 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. |
| Alertra 
Remote web site monitoring and failure notification from global network, supports http, https, ping, smtp, pop3, imap4, ftp and tcp-level checks. |