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 When Dalamud moves to a new level, plugins built for the previous one show (outdated) in the installer and stay off until their authors update them.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.

Enables in-game chat bubbles.
Display alerts upon reaching configurable currencies thresholds.
Track your loot.
Track all your currencies!
Add separators to various numbers.
Visually tracks MP regeneration ticks (Black Mage only).
Determines the most profitable agenda for your Island Sanctuary workshop each cycle
Make hotbar skills that you cant use transparent when sync'd
What it says on the tin.
Simple Waymark Management with Renaming Features

Compasses that detect and mark certain nearby objects/NPCs
Making it easier to know where you are.
Provides an easy copy and pastable CSV format you can use for island sanctuary spreadsheets.
Furniture selection that actually works properly
Customize the layout of the party list.
Skill mod creator
Allows replacing every text box with the background of your choice.

OverlayPlugin for Dalamud with built in HUD replacement
Display estimated stats with Examine, and export gear to Etro/Ariyala.
Mod to allow VR

Suggests bait for ocean fishing.
Fixes SquareEnix' botched antialiasing implementation
A simple tool to record players' used names and nickname
Create vibration patterns for the controller and specify triggers to make it vibrate.
Cast your vote in weekly lighthearted opinion polls! Is a hot dog a sandwich?
The ultimate guidebook for in-game duties, great for sprouts & doing your daily roulettes!
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.
Total control over where to put your hotbar slots.

Show how much damage your DoTs have dealt so far

A game to play when dead. A Puzzle Bobble clone mini-game.
Parses Buffs to help understand what your party is doing.
A Plugin that lets you add notes to item Tooltips
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.
Simmer does the light before every login.

Uploads market data to market.xivhub.org and other configurable aggregators.

Works perfectly out of the box! Use /ii to configure.