有些网站可能挂了。。。。。
www.ichunqiu.com
www.wechall.net/challs
http://canyouhack.it/
https://microcorruption.com/login
http://smashthestack.org
http://overthewire.org/wargames/ 一些writeup http://drops.wooyun.org/author/litao3rd
https://exploit-exercise.com/
http://pwnable.kr/play.php PWN类题目
http://ctf.moomsos.com/pentest/index.php Web漏洞靶场
https://xss.haozi.me/ XSS
http://redtiger.labs.overthewire.org/ SQL
不常见的工具：https://github.com/truongkma/ctf-tools
https://github.com/Plkachu/v0lt
https://github.com/zardus/ctf-tools
https://github.com/TUCTF/Tools