Free internet server status monitoring, alerts by e-mail.

Advanced web site monitoring service which tests website availability from worldwide network of servers. Includes reports for web site performance, downtime, ssl, http, smtp, pop3 server monitoring, and instant alerts.

Online service which allows you to specify Internet resources, web sites, or keywords that you want monitored.

Web site monitoring notifies you via email when a web site is down or new content has been posted.

Monitors websites and other internet servers for availability and performance. Alerts users when their sites or servers are unavailable or performing poorly. Alerts via email, pager, or SMS. Free trial.

Offers 24-hour site monitoring service. Tracks web site performance and accessibility from five global monitoring locations.

Provides web-based network monitoring solutions.

Monitors your web site from the US or Europe.

Monitors availability and performance of web sites, dns, and ftp, including web content checking.

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.