http://www.mysitespeed.com is totally free. It will monitor 10 websites per account, with real time short-term and long term-graphs in a dashboard format. It monitors at 5 minute intervals.
http://nodemeter.net is totally free. It will monitor 10 websites per account every minutes. It show server latency history on graph. Notification on email/jabber
I'd also add StatusCake.com into the mix. It's a free website monitoring service that checks your website for performance issues and downtime every 5 mins from multiple locations. Alerts are sent to you via email, Skype, Twitter, SMS text message or push notification for iOS, Android or Blackberry - e.g. Boxcar or Pushover. Nice features are ability to monitor unlimited number of websites and a public reporting page to show uptime to your users.
Hi Guys, You may want to check out CopperEgg website (and server) monitoring. The product tests sites every 15 seconds, from every testing server (either 4 US or 6 global). Comes with Alerts for email, sms, hipchat, pagerduty, twitter dm and campfire Check out Copperegg.com
Update on StatusCake - they now have 11 global test locations including US, UK, Netherlands, Japan, Singapore and Australia. In addition to downtime monitoring (alerts by email, SMS, iOS /Android push notifications, Skype & Twitter) they check your website for malware. And have social monitoring alerts - so even if your site is up but someone is complaining on Twitter it's not working properly they'll let you know.
Hi i use ogggy.com its a multi website and monitoring website, easy to view the stats. I uploaded 400+ websites in a matter of seconds to their system. hope this helps
Thanks - though looking at Ogggy.com it's far from free for unlimited websites. Monitoring 400+ websites (URLS) would cost
Check https://dominder.com/ for website monitoring service. Much more features than the competitors have