[piotrkulpinski]

Yes, indeed. I didn't know this site until I launched mine, but it seems to me they're just listing all of the popular open source projects.

I've tried to mostly curate the projects that are actively maintained, and have some sort of hosted, paid alternative. This gives you more confidence, that the app will be maintained as they're making money out of it.

[JonChesterfield]

You consider it a good sign that the project is charging money for its use. Others consider that a sign that it's going to become increasingly customer hostile on a short enough timeframe that you don't want to go anywhere near it.

[Kye]

Ardour charges for Windows builds and has for a long time. It's also the only open source DAW I consider remotely comparable to proprietary options.