ACM websites of some schools

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

Spain: (Spanish)
University of walladud: http://acm.uva.es/

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://www.hdubbs.com/(Hangzhou)

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

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

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 andTestData: http://www.karrels.org/Ed/ACM/
ACM community: http://www.608088.com/