- Zenoss Core
- Note: Zennos Core is the open source version.
- 10 Free Server & Network Monitoring Tools that Kick Ass
- serverfault: Server management tool for small network
- Monitoring websites
- urlsnarf outputs all requested URLs sniffed from HTTP traffic in CLF (Common Log Format, used by almost all web servers), suitable for offline post-processing with your favorite web log analysis tool (analog, wwwstat, etc.).