ACM online Judge list

Below is the most comprehensive list of OJ:

Beijing University of Posts and Telecommunications http://acm.scs.bupt.cn/onlinejudge/ (recommended)
Peking University http://acm.pku.edu.cn/JudgeOnline)

Http://poj.grids.cn/(internal)

Zhejiang University http://acm.zju.edu.cn/(recommended)

Tianjin University http://acm.tju.edu.cn/toj/
Sichuan University http://acm.scu.edu.cn/soj/
HKUST http://acm.ustc.edu.cn/
Harbin Institute of Technology Co., http://acm.hit.edu.cn/

Http: // 202.118.224.210

Shantou University http://acm.stu.edu.cn/
Wuhan University http://acm.whu.edu.cn/oak/
Felioj http://acm.whu.edu.cn/felioj/
East China Normal http://acm.cs.ecnu.edu.cn
Xiamen University http://acm.xmu.edu.cn
Hangzhou Electronics Co., http://acm.hdu.edu.cn.
Jilin University http://acm.jlu.edu.cn
Http: // 222.196.33.254/judgeonline/
Harbin Engineering Co., http://acm.hrbeu.edu.cn/
Hunan University http://acm.hnu.cn: 8080/
Fujian Normal http://acm.fjnu.edu.cn/
China Southern Airlines http://acm.nuaa.edu.cn/
Beijing airline http://acm.buaa.edu.cn/
Huazhong University http://acm.hust.edu.cn/judge/
Nankai University http://acm.nankai.edu.cn/
Beijing Normal University Online judge: http://acm.cist.bnu.edu.cn/contest/index.php
Vijos http://www.vijos.cn/(high school student's OJ)

Ultraviolet A http://online-judge.uva.es/problemset/
Ural http://acm.timus.ru/
Sgu http://acm.sgu.ru/
Spoj http://www.spoj.pl
El http://acm.mipt.ru/judge/problems.pl
Krsu http://www.olymp.krsu.edu.kg/
Usaco http://train.usaco.org/usacogate

A comprehensive classification
Acm oj collection (in no particular order ):

Latest online game list: http://www.gccfeli.cn/iac/

China: (China)

China East:

Zhejiang:

Hangzhou University of electronic science and technology (HDU): http://acm.hdu.edu.cn/

Zhejiang University: http://acm.zju.edu.cn/

Zhejiang University of Technology (zjut): http://acm.zjut.edu.cn/

Zjnu: http://acm.zjnu.cn/

Zhejiang industrial and commerce (zjgsu): http://acm.zjgsu.edu.cn/

Ningbo Institute of Technology (NIT): http://acm.nit.net.cn

Zhejiang Lin University (zjfc): http://info.zjfc.edu.cn/acm

Shanghai:

East China Normal University (ECNU): http://acm.cs.ecnu.edu.cn/

East China University of Technology (ecust): http://acm.ecust.edu.cn/

Tongji University: http://acm.tongji.edu.cn/

Jiangsu:

Nanjing University of Aeronautics and Astronautics: http://acm.nuaa.edu.cn

Fujian:

Fuzhou University: http://acm.fzu.edu.cn/

Xiamen University (xmu): http://acm.xmu.edu.cn/

Fujian Normal University (fjnu): http://acm.fjnu.edu.cn/

Anhui:

University of Science and Technology (USTC): http://acm.ustc.edu.cn/

North China:

Beijing:

Beijing Jiaotong University (bjtu): http://acm.bjtu.edu.cn/

Peking University (PKU): http://acm.pku.edu.cn/

Tianjin:

Nankai University (naikai): http://acm.nankai.edu.cn/

Tianjin University (tju): http://acm.tju.edu.cn/toj/

Northeast China:

Heilongjiang:

Harbin University of Engineering (hrbeu): http://acm.hrbeu.edu.cn/

South China:

Guangdong:

Sun Yat-sen University: http://acm.zsu.edu.cn/

Southwest China:

Sichuan:

Http://acm.swun.edu.cn (swun)

Central China:

Hubei:

Hust: http://acm.hust.edu.cn/JudgeOnline/

Wuhan University (whu): http://acm.whu.edu.cn/

Hong Kong, Macao and Taiwan regions:

Hong Kong:

University of Hong Kong (hkoi): http://judge.hkoi.org/

Russia: (Russia)

Ural: http://acm.timus.ru/

Salatov University (sgu): http://acm.sgu.ru/

El judge (mipt): http://acm.mipt.ru/judge/problems.pl

Spain: (Spanish)

Walladud University (ultraviolet A): http://icpcres.ecs.baylor.edu/onlinejudge

United States: (America)

Usaco: http://train.usaco.org/usacogate

Poland: (Poland)

Spoj: http://www.spoj.pl/

Kyrgyzstan: :( Kirgizstan)

Krsu: http://www.olymp.krsu.edu.kg/GeneralProblemset.aspx

BBS of major universities in China:

Http://acm.hdu.edu.cn/forum/ (Hangzhou)

Http://bbs.freecity.cn (Zhejiang University)

Http://bbs.tsinghua.edu.cn (Tsinghua)

Http://bbs.sjtu.edu.cn (hand in)

Http://bbs.fudan.edu.cn (Fudan)

Http://bbs.whu.edu.cn (wuda)

Http://bbs.zjut.com/(Zhejiang University)

Http://bbs.tongji.edu.cn (Tongji)

Http://bbs.xmu.edu.cn (Xiamen University)

Http://bbs.ustc.edu.cn/()

Https://bdwm.net/(Peking University)

Http://bbs.nankai.edu.cn/(Nankai)

Http://bbs.tju.edu.cn/(day)

Http://bbs.sysu.edu.cn/(medium)

Http://bbs.whnet.edu.cn/(huake)

Others:

Http://online-judge.uva.es/board/index.php/ (ultraviolet)

Others:

Topcoder: http://www.topcoder.com/tc

ACM-ICPC: http://icpc.baylor.edu/icpc/

Http://www.usaco.org/

National Computer Olympics: http://ace.delos.com/usacogate

Family of informatics beginners: http://oibh.ioiforum.org/

China Education sugon Network: http://www.chinaschool.org/aosai/

Fujian informatics Olympics: http://www.cfcs.com.cn/fjas/index.htm

IOI: http://olympiads.win.tue.nl/ioi/

Efficient informatics online discriminant System (vijos): http://www.vijos.cn/

ACM routine and test data: http://www.karrels.org/Ed/ACM/

ACM community: http://www.608088.com/