A useful open source tool for storage and retrieval of time series data.

Develops performance tools, evaluates performance-related products, designs system benchmarks, and troubleshoots performance problems. Contact information, events calendar, and links to software tools.

Professional organization for capacity planners.

Schema is a provider of telecom resource management (TRM) solutions that enable operators of wireless networks worldwide to optimize and manage their resources.

Product information about Microsoft's System Center Capacity Planner.

PerfCap Corporation provides Performance Management and Capacity Planning Products and Services.

Performance and capacity planning consultancy and training services. Includes whitepapers. Head office located in London, UK.

Here Joel Goldstein discusses various DB2 capacity metrics.

Cheryl Watson discusses MVS and OS/390 capacity related issues.

This tool allows you to stress test your web server through a LAN or modem connection. It will generate reports for errors and performance.