SolarWinds Log Analyzer - SolarWinds Log Analyzer tool provides comprehensive log management and analysis with out-of-the-box visibility into performance and availability. Free trial!
Paessler PRTG - An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
McAfee Enterprise - McAfee delivers industry leading Internet and Cyber security solutions for Business and Enterprise.
Logz.io - Logz.io provides log analysis software with alerts, role-based access, unlimited scalability and free ELK apps. Index, search & visualize your log data!
MRTG - MRTG (or Multi Router Traffic Grapher) is an open-source network monitoring tool.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services