Website Monitoring Service, Sign up for a free 15-day trial: Site24x7
Get Started with a 15-day free trial. No Credit Card required.
Free
 Professional
Enterprise
Multi-location Website Monitoring 5 basic websites, 1 location.    
Email / Mobile/ Twitter / RSS Alerts      
Uptime & Performance Reports      
Web Application and Full Page Monitoring      
Server Monitoring      
SMTP, POP, DNS, TCP Port, SSL Certificate, (S)FTP      
Multi-User Management      
Root Cause Analysis & APIs      
SLA Monitoring      
On-Premise Monitors      
Support   Email & Phone Email & Phone
Operations Dashboard & Monitor Groups      
Special Discount
(recurring)		   30% 50%
 
Note: During the trial period, you get a fully functional version of the account you sign up for. At the end of the trial, your account will be downgraded to Free account. You can upgrade to a paid account at any stage.