Older releases on Google Code: https://code.google.com/p/bnuoj
An Online Judge system for Beijing Normal University, featuring following awesome functions
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Basic online judge functions;
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Virtual judge functions, including loads of OJs;
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Replay contests and merge standings;
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Contest with challenge sections, like Topcoder and Codeforces;
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Problem categories, delicious for new comers.
And it's still developing!!
Version 3:
Version 2:
Version 1:
https://acm.bnu.edu.cn/contest
https://oj.51isoft.com/contest
OI version:
https://www.bnuoj.com/contestoi