Nmap
Description: Nmap is an open source network discovery and security auditing tool. It is used to discover hosts and services on a network and to detect potential vulnerabilities.
Type: software
Pricing: Free
opsi.org
Description: opsi.org is an open source client management system for Windows networks. It allows administrators to manage software deployment, patch management, license tracking, and hardware/software inventory.
Type: software
Pricing: Open Source