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 When Dalamud moves to a new level, plugins built for the previous one show (outdated) in the installer and stay off until their authors update them.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 a quick special-symbol picker beside the chat mode button.
Lower 3D Resolution Scale

Changes your VO language on a per-duty basis

"See exactly where you stand."
Reminds you about retainer ventures.
See every item you and your party pick up, as it drops.
Adds Moonbase Alpha TTS when in Cosmic Exploration. aeiou!
Out of sight, still in mind.
Display the battery level of your wireless Razer and Logitech devices
Adds QoL features to the native HUD layout editor: Undo, Redo, Copy, Paste and alignment lines.
Even the Ascians needed some tunes.
Someone in our group wouldn't eat their food. I got tired of keeping track if they had or not. Now the plugin does.
Let the heavens guide you, not the map
Look back at that cute search comment even hours later~

Replaces maps with a copy that has SS SB S A B ranks spawn locations, as well as Treasure map locations, including the new Br’aaxskin map.Green Cactuar: S, A, or B spawn location. Black Meteor circle: SS minion. Red Meteor circle: SS
Gives the value of current targets health in Stormtalons from the dead game Wildstar.
Create custom map markers on the map/minimap! Like <flag> but permanent.
Don't you hate CAPS LOCK so much?
Stop yer ears bleedin' in the Wolves' Den
Browse FFXIV roleplay venues in-game with rich filters and schedules.

Better Gearset Sorting
Find what to clean up across your dresser, bags and retainers using the 7.5 Armoire.
Counts both sides of every shared lap :3
Tracking assistant for Yo-kai Watch rewards.

Stream internet radio stations while playing FFXIV
Find cross-DC market opportunities.

Change your neighbours' housing exterior appearance.
Time your jumping puzzles!
Quiets the Gameplay Experience.

Customized mount roulette per job.

RuneLite inspired drop-tracker

Tired of missing stuff cause everything is in another timezone? Say less.
Sums up all "skill" levels like that one classic MMORPG
Marketboard analytics for FFXIV
Send game info over MQTT

Beard Stubbles and enhanced textures for all male highlander faces!
RequiresTexTools

If it's not 'big fat tacos', what ARE they singing?
Host your chat on a web server so you can talk from anywhere.
Shows an improved ingame (and outgame map) and collects the seen information to display later.
Add various in-game events to your Steam Game Recording timeline, comes with instructions for non-steam users!