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
Webmin
Description: Webmin is an open source web-based interface for system administration of Linux systems. It allows administrators to manage user accounts, Apache, DNS, file sharing and more from a web browser.
Type: software
Pricing: Open Source