tcpdump - tcpdump is a common packet analyzer that runs under the command line.
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
VueScan - Third-party software for film scanners and flatbed scanners.