b3arlythere

It offers a file driven framework rather than just a web-editor.

With that comes many different strengths including plugins, importing libs/modules to the deployables, as well as components. It also has a variety of examples to work with.

As a Junior - Intermediate Dev, I'd say these are usually pretty good places to start. These usually give the codebase some easy wins and help the junior build up confidence.

In addition, since they're not part of the main project, it's not very stressful on the junior's side (assuming they realize that their work isn't blocking or holding up someone else). Probably one of the most stressful things I remember is trying to get up to speed as quickly as possible since I felt like I was holding back the work.