ColoredGlowLib

Entities can glow in any color instead of the plain white outline that vanilla Minecraft uses. A color is set per entity, per entity type or as a default, and the target can be a player name, a UUID, a selector such as @e, or a type such as minecraft:sheep. Colors are written as hexadecimal codes, so a value from an online color picker can be pasted in directly. The keyword rainbow gives an entity a shifting color instead of a fixed one.

Animated colors come from datapacks. A datapack adds a custom animation, and the library then plays that animation on glowing entities, for example a rainbow cycle that changes over time. Normal players use commands to apply colors, while developers can add new animations and use the API described in its javadoc guide. Removing a color, reading the current value of a setting and overriding the team colors that Minecraft assigns are all handled by commands as well.

The library requires Fabric API on Fabric and needs the Cardinal Components API added as a separate project, since the mod bundles it but a dependency still has to be installed. ColoredGlowLib is open source under the GNU Lesser General Public License v3.0 only, and it runs client-side, with the server optional. Files are published for Fabric, Forge and Quilt, with the latest build covering 26.2. Forge builds carry a +forge suffix in their version number.