An online judge is an online system to test programs in programming contests. They are also used to practice for such contests like ICPC. The system can compile and execute your code, and test your code with pre-constructed data. Submitted code may be run with restrictions, including time limit, memory limit, security restriction, and so on. The output of the code will be captured by the system, and compared with the standard output. The system will then return the result.
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)
Open source online judge based on Vue, Django and Docker. | 青岛大学开源 Online Judge | QQ群 496710125 | admin@qduoj.com
Robust, fast, scalable, and sandboxed open-source online code execution system for humans and AI.
⚡ The most advanced open-source automatic algorithm online judge system | 南京邮电大学开源 Online Judge | QQ群：668108264
⚡🔥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 !)
✨ 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
A multiple pages app built for OnlineJudge
Jiangnan Online Judge
Online Judge system designed for competitive programming and algorithmic problem-solving.
Holding contests using problems from other OJs!!
洛谷风格在线评测系统 | Django + Bootstrap5 开发。支持用户系统、题目库、多语言代码提交（C/C++/Python/Java）、提交记录、排行榜及管理后台。轻量级 OJ，适合编程练习与竞赛训练。Luogu-style Online Judge built with Django & Bootstrap5. Features: user auth, problem set with difficulty tiers, multi-language code submissions (C/C++/Python/Java), submission logs, leaderboard, and admin panel.
Archived frontend for Putong OJ. Code has been merged into the main monorepo.
Hangzhou Normal University Online Judge
Online Judge System for Shijiazhuang No.2 Middle School, based on Universal Online Judge.
A modified SYZOJ-based online judge with tag library and solution review system.
OnlineJudge 平台 YuJudge 的判题核心，基于 C 编写，支持在 Linux 下运行。程序基于可执行文件以及标准输入输出目录、资源限制等配置，执行并给出资源消耗情况，并能防止恶意调用。