THIS PROJECT IS NOT MAINTAINDED ANYMORE
Using this plugin you can send emoji from other server and animated emotes without having Nitro. This works by automatically replacing selected emoji with a corresponding image link.
It even works for animated emoji. Because it's sending an image link it won't work mid-sentence or for sending multiple emoji at once. But for single emote messages it's almost much seemless.
This plugin is adapted from FreeEmojis by m0nsterdev. It adds a number of options so you can configure it as you see fit. You can change the size of the sent emoji, and it enables you to send emoji that FreeEmojis can't.