Guide I found about hacking, pretty helpful to learn. (OLD)
You can do anything on this host; couldn't find a ToS.
How to set up a honeypot with an IDS, ELK, and TLS traffic inspection.
An open-source, large scale, full packet capturing, indexing, and database system.
IT Security Certification Roadmap charting various security certifications.
GreyNoise collects and analyzes untargeted, widespread, and opportunistic scan and attack activity.
This is an HTTP, HTTPS, socks4, and socks5 proxy scanner made in Golang. It uses Zmap to scan, which can be slow.