Hydro - Next generation high performance online-judge platform - 新一代高效强大的信息学在线测评系统 (a.k.a. vj5)

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

⚡🔥Hcode Online Judge(HOJ)🔥⚡：基于SpringCloud与Vue前后端分离，分布式架构的在线测评平台OJ (An open source online judge system base on SpringBoot, Springcloud Alibaba and Vue.js !)

High Performance JSON Serialization for ActiveRecord & Ruby Objects

PAT OJ exercises in C language 浙江大学PAT纯C语言题解。

✨ Open source online judge system (based on Microservice). SDUOJ 开源在线评测系统（基于微服务架构）。开源社区QQ群 808751832。示例网站 https://demo.sduoj.com

Sandbox Server in REST / gRPC API. Based on Linux container technologies.

北航OJ通关攻略，包括北航软件学院的在线评测网站（OJ）——AC编程（accoding.buaa.edu.cn）开放课程的全部题解

Jiangnan Online Judge

在线练习系统 ==> 后端：基于Gin、Redis、Gorm实现 前端：基于Vue、Element实现

The answers for luogu.com.cn for you in different languages.

Holding contests using problems from other OJs!!

⚡️ Faster JSON serialization for Ruby on Rails. Easily migrate away from Active Model Serializers.

Virtual Online Judge（VOJ）是基于微服务架构的高性能在线评测系统。拥有本地判题服务，同时支持其它知名 OJ (HDU、POJ...) 的远程判题。采用现阶段流行技术实现，采用 Docker 容器化部署。

✅ Generate TypeScript interfaces from your JSON serializers

A lightweight, high-performance, universal program judger supporting multiple languages, special judge and SQL judge.

A simple program executor —— 简单到用命令行就能跑起来的代码评测工具

An online judge system designed for OI training.

Online Judge Kernel，Virtual Judge Adapter，Command-Line Interface， Telnet Server， FTP Server

使用JSP实现的OJ系统，支持用户提交C、C++和Java语言的代码