uWebSockets-express by colyseus

ActivityPub federated instant messaging server. https://shoot.pub. Maintained by MaddyUnderStars on GitHub, where it has earned 57 stars from the community.

Open Source alternative to Spotify Collaborative Playlists. Turn your device into a jukebox where a group can queue music together and fighting over aux. Maintained by skeptrunedev on GitHub, where it has earned 309 stars from the community.

Kurakani - an easy platform to quickly chat with people all around the globe. Maintained by GiloByte on GitHub, where it has earned 58 stars from the community.