6. Vuln Machines — Videos and Labs. 7. Try2Hack — Interactive Learning. 8. Pentester Land — Written Content. 9. Checkmarx — Interactive Learning. 10. Cybrary — Written Content and Labs. 11. RangeForce — Interactive Exercises. 12. Vuln Hub — Written Content and Labs.
13. TCM Security — Interactive Learning. 14. HackXpert — Written Content and Labs. 15. Try Hack Me — Written Content and Labs. 16. OverTheWire — Written Content and Labs. 17. Hack The Box — Written Content and Labs. 18. CyberSecLabs — Written Content and Labs.