1)   PA Server Monitor 3.4
PA Server Monitor is a Windows service that monitors the health and availability of Windows servers, network services (on Windows, Linux and other operating systems), and devices. No agents are needed to monitor remote servers. Rich reporting too.
server monitor, restart service, server monitoring, disk space monitor, web page monitor, event log monitor, ping monitor, performance counters, service monitor, file change monitor,

 2)   PA Storage Monitor Pro 3.1.0
PA Storage Monitor will monitor very large server disk volumes and report on file age distribution, type distribution, file owners, etc, etc. It will also monitor free disk space, disk quotas, etc. Many different alerts are included.
storage management, storage monitor, storage monitoring, disk space monitor, disk usage reports, user quota, directory quota, quote monitor,