Plugins and mods
Dalamud plugins add features to Final Fantasy XIV while it runs. You install them from the Plugin Installer, which the /xlplugins chat command opens once the game is started through XIVLauncher.
Each plugin is built for one Dalamud API level. When Dalamud moves to a new level, plugins built for the previous one show (outdated) in the installer and stay off until their authors update them.
Mods from Nexus Mods replace the game’s models, textures and sounds on your own client and are loaded with Penumbra or TexTools.
Adds row probabilities to the Wondrous Tails display.
Simple Waymark Management with Renaming Features
A 2D pool game inside Final Fantasy XIV.
This is still mostly a dev tool for debugging, but people like it?
A classic arcade game.

Show how much damage your DoTs have dealt so far

A game to play when dead. A Puzzle Bobble clone mini-game.
View encounter strategy images.
No more cringe during hunt trains. Temporarily filters away Shouts and Yells that don't contain a flag or an instance message.
Automatic house bidding reminders!
Find party finder groups easier.
Find and collect creatures to fight.
Tweaks and options based on the charactor's state.
Generate a crafting list for the faded orchestrion rolls in your inventory
A game to play when dead. A 2048 clone mini-game.
A bomberman-clone game to play when dead.
Tracks gil gained and spent during the session.

Know your Fashion Report points on the spot and help crowdsource new items and dyes!
A game to play when dead. A super hexagon clone mini-game.
Ever wanted to know how many levels you have across all your jobs?
Flash the game in taskbar when a cutscene ends and the game is unfocused.

I spent hours wokring hard coding so I could be lazy! Wouldn't you?'
Shrinks characters based on their Health!

Recording activity indicator.

Choo Choo