I am not checking them at regular intervals but i hope they still work and are relevant.
Please provide me some feedback if for some reason they are not relevant or working anymore.
- http://pwnable.kr/
- https://lab.pentestit.ru/ (Similar to OSCP labs.)
- https://picoctf.com/ (Designed for high school students)
- https://microcorruption.com/login (introduction to low-level reverse engineering, specifically on an MSP430)
- http://reversing.kr/
- http://hax.tor.hu/
- https://w3challs.com/
- https://pwn0.com/
- http://www.smashthestack.org/
- http://ringzer0team.com/
- http://www.hellboundhackers.org/
- http://www.overthewire.org/wargames/
- http://counterhack.net/Counter_Hack/Challenges.html
- http://www.hackthissite.org/
- http://vulnhub.com/
- https://www.cybrary.it/
- https://greysec.net/index.php
- http://www.cis.syr.edu/~wedu/seed/all_labs.html
- https://github.com/wtsxDev/Penetration-Testing