Basics
- Notepad https://privatebin.net/
- Shared Notepad http://etherpad.org/
- Identity https://keybase.io/
- Email https://protonmail.com/
- Chat https://crypto.cat/
- Mobile https://signal.org/ AND https://briarproject.org/
- Disk\File Encryption https://www.veracrypt.fr/en/Home.html
Hosting
- SSL Certs https://letsencrypt.org/
- DNS Registration https://njal.la/
Fun Stuff
- haveibeenpwned
- Shodan
- WebGun
XSS Payload Creator - Hackvertor
Convert encodings - Fuzzdb
- SecList
Coding
CTF
- https://picoctf.com/
An always-open game targeted for high school students - http://ghostintheshellcode.com/
An annual capture-the-flag contest that takes place Jan/Feb.
Challenges
- https://www.microcorruption.com/
Play entirely in your browser - http://pwnadventure.com/
Hack the Pwn Adventure 3: Pwnie Island MMORPG - http://overthewire.org/
This is a series of games played over SSH - https://exploit-exercises.com/
VMs galore - http://breakthisqli.rf.gd/
BOBBY DROP TABLES; REPRESENT - https://reversing.kr/
Reverse engineering challenges - https://ringzer0team.com/
Huge amount of challenges - https://ethernaut.zeppelin.solutions/
Etherum/Solidity wargame inspired by overthewire