Immersive Messages is an API for mod developers and modpack creators to get information directly to the player--by rendering it right on their screen with subtitles!
This mod integrates with the custom font rendering Caxton (note: not on Curseforge yet, you will need to download manually if you want fancy fonts!) to provide a system for modpack creators and mod devs to give stylized and immersive experiences to their players.
This mod also provides a built in animation system with transition effects, text effects such as shaking and waving, and full control over the size/color/position of all text on the screen. All messages can also be sent over the network from server -> client using either the direct mod API, or, if you aren't a coder, using the built-in default Minecraft command /immersivemessages.
What you use it for is up to you! Check out what's possible in the showcase video above.
For Developers
You can read the documentation at https://immersive.txni.dev/