Below are a few example of some good tools out there to be used for hacking, troubleshooting or just for fun.
Pen-testing Operating Systems
Parrot OS: https://www.parrotsec.org/download.php
Kali OS: https://www.kali.org/downloads/
BlackArch: https://blackarch.org/downloads.html
BackBox: https://www.backbox.org/download/
USB Hacking
Cactus WHID: https://github.com/whid-injector/WHID/wiki (Buy from Tindie)
RubberDucky: https://shop.hak5.org/products/usb-rubber-ducky-deluxe
Networking Monitoring
WireShark: https://www.wireshark.org/download.html
Ettercap: https://www.ettercap-project.org/downloads.html
Etherape: https://etherape.sourceforge.io/
Exploitation Tools
Metasploit Framework: https://www.metasploit.com/download
Armitage: http://www.fastandeasyhacking.com/download/
BeEF: https://beefproject.com/
Online Reconnaissance Tools
Shodan: https://www.shodan.io/
ThreatCrowd: https://www.threatcrowd.org/
Zoomeye: https://www.zoomeye.org/
Censy: https://censys.io/
URLScan: https://urlscan.io/
Rogue Access Point
WiFi-Pumpkin: https://github.com/P0cL4bs/WiFi-Pumpkin
Airbase-ng: https://www.aircrack-ng.org/doku.php?id=airbase-ng
Ransomware Variants
The Zoo: https://github.com/ytisf/theZoo
Linux Malware: https://github.com/greg5678/Malware-Samples
FabriMagic72: https://github.com/fabrimagic72/malware-samples
Password Attacks
Medusa: http://www.foofus.net/jmk/tools/medusa-1.1.tar.gz
John: https://www.openwall.com/john/
OphCrack: http://ophcrack.sourceforge.net/download.php?type=ophcrack
amoran.io 