Academic Online Judges

1. UVa Online Judge
2. URI Online Judge 
3. Sphere Online Judge (SPOJ)
4. Aizu Online Judge
5. Timus Online Judge 
6. PKU JudgeOnline
7. Zhejiang University Online Judge
8. El Judge
9. Tsinghua Online Judge
10. Caribbean Online Judge
11. Don Mills Online Judge
12. National Tsing Hua University Online Judge
13.Tianjin University Online Judge
14. Programming Club IIT Kanpur
15. Saratov State University Online Contester
16. PEG Judge
17. IARCS Problems Archive
18. RACSO Online Judge
19. Baekjoon Online Judge
20. GEPWNAGE Online Judge
21. Shanghai Jiao Tong University Online Judge
22. JollyBee Online Judge - BINUS University
23. Herbert Online Judge
24. LightOJ
25. FAU Online Judge
26. National Taiwan University Online Judge
27. ZeroJudge
28. UESTC Online Judge
29. Programming Challenges
30. ZeroJudge.tw
31. Teddy Online Judge
32. Sicily Online Judge
33. Kattis
34. Assumption University Online Judge
35. RealOJ
36. Sichuan University Online Judge
37. Jobdu Online Judge
38. Wuhan Online Judge
39. ShareCode
40. NUC Online Judge
41. HIT Online Judge
42. TNFSH Online Judge
43. TIOJ INFOR Online Judge
44. JKKNIU
45. ACDream
46. HDU Online Judge
47. ICPC Live Archive
48. HUST OJ
49. Fuzhou University Online Judge
50. Lydsy
51. Central South University Online Judge
52. Lviv National University Online Judge
53. Colombian Collegiate Programming League