I made a three minute little demo video of my fediverse server. If you are interested in what it looks like, check it out here:
https://www.loom.com/share/6badbdc6b45f4bf8b0eba293103e9246
This is a stand-alone node app that speaks ActivityPub. It has an ActivityPub API interface, a public profile, and also a browsing interface to interact with people you follow.