xibo VS Anthias

It looks like I'm not the only person who has faced this. apache-based images require buster, for instance, and some docker images that rely on Ruby face issues too (for example, I decided to try setting up Postal but it looks like it's facing the same issues).

Xibo is reasonably priced as a SASS or completely free with self-hosted, 100% open source options available. https://xibosignage.com/

Google for signage solutions. If I remember corecty the xibo was able to work also as screensaver (used it for university vide setup arund 14 years ago) https://xibosignage.com

Along a similar line, I've had a lot of success with Xibo (https://xibosignage.com/). Host internally yourself for no cost.

According to the program that stopped working, the name is Xibo Open Source Digital Signage, which can be found here: https://xibosignage.com

Link for the lazy

I used Xibo on a school campus I was running. I haven't used the new version, but it does support some level of interaction.

I used ScreenlyOSE Anthias + BalenaCloud on about 7 Pi devices to manage a small-scale DSS rollout. BalenaCloud allowed fleet-wide updates, etc. and a rudimentary VPN tunnel to connect to each Pi. It might scale to 4,000, but you'll spend a lot of time babysitting that.

There’s also screenly which is open source and has a paid version if you want more advanced features: https://anthias.screenly.io/

Anthias is the free version of Screenly: https://anthias.screenly.io/

We used to use the Open Source Edition of Screenly. If you're okay with managing each display separately by IP it might be a workable option, though time consuming. Paid version offers a centralized CMS, but I haven't tried it.