# Hydro
![GitHub Workflow Status ](https://img.shields.io/github/workflow/status/hydro-dev/hydro/CI )
![hydrooj ](https://img.shields.io/npm/dm/hydrooj )
![npm ](https://img.shields.io/npm/v/hydrooj?label=hydrooj )
![node-current ](https://img.shields.io/node/v/hydrooj )
![GitHub contributors ](https://img.shields.io/github/contributors/hydro-dev/Hydro )
![GitHub commit activity ](https://img.shields.io/github/commit-activity/y/hydro-dev/Hydro )
Hydro is a high-performance online judge system.
It is easy to deploy (with install script), light weight and extensible.
Also see previous version at [vijos/vj4 ](https://github.com/vijos/vj4 )
Now we have a SaaS service running at [https://hydro.ac ](https://hydro.ac ). (Fully free of charge!)
You can easily have a glance at the features of the system and try it out.
You can also just use the service without self-hosting the system with the powerful `domain` feature.
Feel free to create an account and then navigate to `MyAccount > MyDomains > Create Domain` to create one.
[中文 ](https://hydro.js.org/ )
[Open pre-configured test environment in Gitpod ](https://gitpod.io/#https://github.com/hydro-dev/Hydro )
## Contact US
Email: i@undefined.moe
Hydro QQ User Group: 1085853538
Telegram Group [@hydrodev ](https://t.me/hydrodev )
Telegram [@webpack_exports_undefined ](https://t.me/webpack_exports_undefined )
## License
The software is distributed under AGPLv3 with additional terms.
Additional terms under AGPLv3 Section 7:
1. You must not remove the copyright declaration displayed in the software. (Under [AGPLv3, 7(b) ](LICENSE#L356 ))
2. When you distribute a modified version of the software, you must change the software name or the version number in a reasonable way in order to distinguish it from the original version. (Under [AGPLv3, 7(c) ](LICENSE#360 ))
## Contributing
See [CONTRIBUTING.md ](CONTRIBUTING.md )
## Thanks to
In dictionary order:
- [Github ](https://github.com/ ) Code hosting and workflow.
- [criyle ](https://github.com/criyle ) Sandbox.
- [Vijos ](https://github.com/vijos/vj4 ) UI framework.