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Aircrack-ng

Is an 802.11 WEP, 802.11i WPA/WPA2, and 802.11w WPA2 key cracking program.

atftp

Can be used interactively or in batch mode to retrieve files from TFTP servers.

Cain

ARP poisoning / credentials - network.

Bettercap

The Swiss Army knife for WiFi, Bluetooth Low Energy, wireless HID hijacking and Ethernet networks reconnaissance and MITM attacks.

Networking

Tools related to networking.

BTNAP

Bluetooth Network Access Point for Raspberry Pi.

netsh

Is a command-line utility that allows you to configure and display the status of various network communications.

cidr2ip

This program converts IPv4 CIDR blocks into their constituent IP addresses.

Create_ap

This script creates a NATed or Bridged WiFi Access Point.

Route

Manipulates network routing tables.

NetworkMiner

NetworkMiner is an open source Network Forensic Analysis Tool (NFAT) for Windows (but also works in Linux / Mac OS X / FreeBSD)..

Proxychains

ProxyChains is a UNIX program, that hooks network-related libc functions in dynamically linked programs via a preloaded DLL and redirects the connections through SOCKS4a/5 or HTTP proxies.

Samba

Server to provide AD and SMB/CIFS services to clients.

ssh

ssh (SSH client) is a program for logging into a remote machine and for executing commands on a remote machine.

ifconfig

Configure a network interface.

sshuttle

Transparent proxy server that works as a poor man's VPN. Forwards over ssh. Doesn't require admin. Works with Linux and MacOS. Supports DNS tunneling.

Subnet Calculator

Subnet calculator written in Python. It takes IP address and subnet mask as an input and returns for a given subnet network and broadcast address, first and last IP host, wildcard mask and number of usable hosts.

ip

Show / manipulate routing, network devices, interfaces and tunnels.

Swaks

Swiss Army Knife for SMTP.

TShark

Dump and analyze network traffic on CLI.

Wireshark

Is the world's foremost and widely-used network protocol analyzer.

netplan

YAML network configuration abstraction for various backends.

nmcli

Command-line tool for controlling NetworkManager.