Penetration Testing Resources
- Pentester Tips - Penetration Testing Tips, Skills Matrix
- PwnWiki - collection TTPs (tools, tactics, and procedures) for what to do after access has been gained.
CTFs
- Wechall - wargames, challenges
- CTF Writeups - CTF writeups
- Pentestit Lab - lab to practice pentesting skills
Exploit Development and Reverse Engineering
Links and Lists
- Awesome Penetration Testing - Pentest resources
- Cheat Sheets - several cheat sheets