GoToSocial

GoToSocial is an ActivityPub server written in Go. It matches most Mastodon functions, and allows for fairly seamless interaction with existing sites and apps.

I use it as a single-user instance to participate in the Fediverse. I didn’t want to join an existing Mastodon server for a variety of reasons, and GoToSocial is super light-weight, making it easy to install on my personal VPS.