This is a great idea! I'd love to see a Community Apps registry.
Hopefully, as HexOS gets more popular, there's a real-world scenario where companies or platforms would be their own maintainers of their own apps, rather than the crew at HexOS. Outside of that, niche use cases could be better solved once and shared via a small community and listed as 'unverified' but still gives a way for people to try solutions that others have put forward.
In SCALE we have access to container-based-apps, via https://www.truenas.com/docs/scale/22.12/scaletutorials/apps/docker/, which could mean an initial version of this could be as simple as basic setup and launch configurations for existing Docker images which are already maintained by the parent organization or open-source developers.