Akkoma is a microblogging server software that can federate (= exchange messages with) other servers that support ActivityPub, like Friendica, GNU Social, Hubzilla, Mastodon, Misskey, Peertube, and Pixelfed.
Disroot Akkoma: https://fe.disroot.org
Project homepage: https://akkoma.social/
Source code: https://akkoma.dev/AkkomaGang/akkoma
Akkoma's features highlights:
You can exchange messages with people on any ActivityPub or OStatus servers, like GNU Social, Friendica, Hubzilla and Mastodon.
Write what you have in mind!
With Akkoma, you're not restricted to 150 characters! You can add links, images, polls, etc.
Receive notifications when someone adds you as a contact, when you're mentioned in a post or when one of your posts in shared by someone.
Send messages to other members of Disroot's Akkoma with a real time chat.