Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.

DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.

Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use

Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.

Zenmap - Zenmap is the official cross-platform GUI for the Nmap Security Scanner.

Maltego - Maltego is an open source intelligence and forensics application.