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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Try https://pisignage.com/. It's relatively cheap and can be installed on a Raspberry PI. You can either self host the server or pay them a small fee to do it for you.
/u/slugshead mentioned Xibo. They've discontinued Pi-compatible versions but run on a lot of other things. Player(client) licenses per major version are perpetual, or at least very long. I've seen some weird issues with them, don't know if it's fixed (mostly has to do with display scaling, probably related to the consumer-grade smart TVs I have to run it on).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.