UptimeRobot
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(s), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
Port Monitor is an easy and online tool that does website and server monitoring for you 24/7 every 60 seconds and sends you or your co-workers instant email/push notifications when something goes wrong.
port monitor is an easy and online tool that does website and server monitoring for you 24/7 every 60 seconds and sends you or your coworkers instant email/push notifications when something goes wrong.
it records uptime, website/server response times (performance) and downtime causes when something goes down.
generate your own custom reports and receive instant email alerts or weekly/monthly reports.
you can have 2 monitors for free.
Official Website
Twitter
Facebook
Productivity Developer Tools Networking and Admin Online Services
website-monitoring server-monitoring uptime-monitoring notifications
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(s), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
Freemium Web
StatusCake enables the visitor to track unlimited websites for free and get alerts when the site is down or having trouble. StatusCake also tracks performance over time so a webmaster can detect issues because they arise.
Freemium Web
Server monitoring software for physical, virtual, and cloud-based IT. They also do email monitoring, application monitoring. The system is used to provide insight into server up-time and reduce outages. .
Commercial Windows Linux iPhone Web
PHP Server Monitor is a script that checks whether your websites and servers are up and running.
Free Open Source Windows Linux BSD Self-Hosted PHP
Opsview Atom is ideal for personal use, SoHo setups, test or lab environments or just to get your hands dirty with all of Opsview's monitoring functionality!.
Free Linux
Monitority is a free & reliable website monitoring service that enables users to track unlimited services (websites, urls or ip addresses etc.) and receive alerts (via email, text-sms, tweet) when these services are not responding.
Free Web
Pingoscope will carefully monitor your website and alert you instantly if it goes down.
Freemium Web
"Is It Down Right Now" monitors the status of your favorite web sites and checks whether they are down or not. Check a website status easily by using the below test tool.
Free Web
AgentSlug.com is simple but perspective application to monitor your website. For now, you can find there a full featured uptime monitoring tool.
Freemium Web
Flexible server and network monitoring solution delivers a unified view of your entire IT environment.
Freemium Windows Linux Android iPhone Android Tablet iPad
RapidSpike is an uptime and performance monitoring service for websites and web applications. Monitor, measure and test your digital platform eco-system from one dashboard. .
Commercial Web