How to: Generic Tools
https://ahrefs.com/backlink-checker
# Try the free version of Ahrefs' Backlink Checker.

https://gchq.github.io/CyberChef/
# The Cyber Swiss Army Knife

https://github.com/securisec/chepy
# Chepy is a python lib/cli equivalent of the awesome CyberChef tool.

https://packettotal.com/
# Pcap analysis and samples

https://github.com/vavkamil/awesome-bugbounty-tools
# A curated list of various bug bounty tools.

https://check-host.net/
# Check-Host is a modern online tool for website monitoring and checking availability of hosts, DNS records, IP addresses.

https://github.com/fyoorer/ShadowClone
# ShadowClone allows you to distribute your long running tasks dynamically across thousands of serverless functions and gives you the results within seconds where it would have taken hours to complete.

https://github.com/A-poc/RedTeam-Tools
# This github repository contains a collection of 125+ tools and resources that can be useful for red teaming activities.

https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/Indexes/Indexes-Markdown/index.md
# All Atomic Tests by ATT&CK Tactic & Technique (https://atomicredteam.io/atomics/).

https://github.com/fransr/unpack-burp
# This is a small tool created by Frans Rosén. For unpacking base64:ed "Save items"-content from Burp.

https://github.com/codingo/Interlace
# Easily turn single threaded command line applications into a fast, multi-threaded application with CIDR and glob support.