Talk within a range, disabling global chat and adding a few handy commands to assist chat.;
https://minecraft.curseforge.com/projects/whisperingshout MIT Licensed
Server, not required on client.
#Commands
Says something to all players on the server, uses hunger!
/shout <Message ... ... ...>
/s <Message ... ... ...>
/sh <Message ... ... ...>
Says something to all players within 100 blocks of you. configurable