Apps with 'Uptime Monitoring' feature
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.
Conky is a free, light-weight system monitor for X, that displays any kind of information on your desktop. Originally a fork of Torsmo, Conkys torsmo-based code is BSD licensed.
Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong.
Cities: Skylines is a modern take on the classic city builder.
Website Health and Performance Monitoring Service.
PHP Server Monitor is a script that checks whether your websites and servers are up and running.
An easy way to check whether a website is down for everybody, or just your own computer.
StatusCake.com is a free website monitoring tool which allows users to track up to 10 websites and get alerted when their site is down or is having trouble.
Pinpoint and solve performance issues in your Ruby, Java, .NET, PHP and Python apps with real user, application and server monitoring.
All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information. .
Track web page changes and get notified. Free Sign-up. Have all data in one place
SaaS monitoring tool for linux servers and websites. Think up-time robot but with more features. You can monitor your linux hosts, windows hosts under development.
Next-generation Rank Tracker & SEO Monitoring solution that understands modern SEO, finally.
Free open-source website monitoring software, easy to set up and use for monitoring web sites.
Checkmk is comprehensive IT monitoring solution in the tradition of Nagios. Checkmk is available as Raw Edition, which is 100% pure open source, and as Enterprise Edition with a lot of additional features higher performance and professional support.