Is there a link to download the app?
We only offer an install via
npm. So you can run npx polygonjs-editor and it will download and run it.
The reason is that this will allow you to track the editor version for each of your projects. You can then use the editor just like any other npm dependency. It's just as simple, and also much more convenient.
Is it open source?
is open source and free to use.
But the visual editor is under a commercial license.
Do I need to keep paying to run the created WebGL apps on my site?
No. As soon as you don't need to use the editor, you are very welcome to downgrade to a free plan.
Your WebGL app will then run with the open source engine, which is free to use.