Coordinator+

The mod draws a customizable bossbar that works like a compass and shows the direction the player is facing. It also displays how the coordinates change while moving in a given direction, which helps with navigation during travel and mining. Only the client needs it, so servers run without it and players can use it on any server.

Coordinator+ is described by its author as a beta with limited functionality, offered as a proof of concept while feedback is gathered. Planned work includes a link to the original Coordinator plugin, so a switch between client-side and server-side data could be added, and full texture pack configuration. The release is published for Fabric only, for 1.21.8, under the MIT License, and it is not open source.