Top 7 judge open source projects

A lightweight⚡high performance💪universal🍭program judger, support multiple languages, special judge and SQL judge💡轻量高性能的程序评测核心, 易于扩展和二次开发, 支持多编程语言, SPJ和SQL评测

Popular Open Source Online Judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training, with easy installation. 开源OJ系统

Online Judge System of Zhejiang Normal University

SPOJ like judge to automatically judge the submitted solution.

💎 Documented algorithmic problems/solutions + datastructures

Serverless Judge System

Judge 13.2 - HypeX