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
Sentry
Description: Sentry is an open-source error monitoring system that helps developers monitor and fix crashes in real time. It provides full stacktraces and context on bugs or errors in web apps, mobile apps, games, and APIs.
Type: software
Pricing: Freemium