Nagios network monitoring software is enterprise server monitoring
OpenDDS is open source publish/subscribe middleware
Zenoss - Intelligent IT Operations Management
Snare Enterprise: bit.ly/Snare-Trial
The open source grid computing solution
UNIX Performance Monitoring / Trend Analysis Java Software
X2CRM - Workflow, Sales, Marketing, Workflow, Custom Apps, PHP, MySQL
Portable, complete and BSD-licenced IEEE 1588 (PTP) implementation
Software, Server and Application Monitor
Open Source Enterprise Project Management Software for PPM and PPO