The Governor - Network Monitoring
WatchDirectory - WatchDirectory monitors a file system directory and performs tasks when certain conditions are met.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Watch 4 Folder - Watch 4 Folder is a simple to use, small and portable tool to monitor folders and file activities.
NetVizura NetFlow Analyzer - NetFlow Analyzer is a solution for bandwidth monitoring and traffic analysis. It helps with traffic investigation, analysis and reporting
iWatch - iWatch is a realtime filesystem monitoring program.