Takahē is an ActivityPub server designed for efficient use on small- to medium-size installations, and which allows you to host multiple domains on the same infrastructure.
It’s currently in an beta state, meaning most things work and it can talk to most of the Fediverse, but there’s still some polish and features left to add.
The flagship instance can be found at takahe.social, and if you’re interested, you can also learn more in our documentation, browse the code on our GitHub repository, come and chat to us on Discord, or read some of Andrew’s blogs about building it.