https://plantuml.com/
https://blog.jetbrains.com/dotnet/2020/10/06/create-uml-diagrams-using-plantuml/

```puml
Bob->Alice : Hello!
```

https://mermaid.js.org/#/

```mermaid
graph LR
    A[Write Code] --> B{Does it work?}
    B --> NO --> D[Google]
    B --> YES --> C[GREAT!]
    D --> A
```


> NOTE:\
> Gitea has support for mermaid.\
> Doesn't have support for puml.\
> (obv talking about default behavior)