Akkoma is an active fork of Pleroma, which implements ActivityPub protocol underneath and serves an interface similar to microblogging platforms such as Twitter or Tumblr. It implements a complete Mastodon client API, so all Mastodon clients work with it without trouble, even the Mastodon web UI can be installed and used with Akkoma.

Why Akkoma over Mastodon? It’s written in Elixir, so it’s faster and uses less resources than Mastodon. You can also define a character limit to your posts, use markdown formatting, quote posts and add emoji reactions. Perfect for small personal instances, you can run it super cheap.