RackTables - Racktables is a nifty and robust solution for datacenter and server room asset management.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
ITDB - ITDB is a web based asset inventory management tool used to store information about assets found in...
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
DCImanager - DCImanager is a platform for managing physical equipment. Connect any physical equipment to a single platform. Use the platform to manage your servers, switches, PDU as well as physical and virtual networks.
Better Uptime - We call you when your website goes down