CPM - Critical Process Monitor
 - A powerful networked system monitoring and diagnostic toolset.  It is easy to learn and use, employing a Motif-based HP-VUE integrated user interface. 
Freshwater Software
 - SiteScope, real-time web site monitoring software.  Check disk space, cpu usage, servers, processes.  Notification by email or alphanumeric pager. 
Nebula-CPPS (Capacity Planning and Performance Measurement System)
 - allow you to measure performance of workstations and file servers across large distributed networks. 
OpenAviator
 - is a UNIX and NT based Performance Monitoring Solution for 17 UNIX architectures, Sybase, Ingres, Oracle, Informix. 
PATROL
 - Consists in part of an optional console and server-based agents. When combined with independent Knowledge Modules (KMs), users have a powerful, distributed family providing proactive management support for the client/server enterprise. 
SarCheck
 - a performance analysis tool  for UNIX systems. 
Spire Technologies
 - is a UNIX and NT based Performance Monitoring Solution for 17 UNIX architectures, Sybase, Ingres, Oracle, Informix.