XIV Todo

Keep track of the content you do. https://xivtodo.com/

Teamcraft

This is the best tool for assisting  with any crafting or gathering duties. The desktop version of the app is also able to check your inventory and character stats which make or options a lot easier, like finding suitable crafting rotations. https://ffxivteamcraft.com/

Party Finder

Looking for Party Finders? Visit https://xivpf.com/
Though this page is loaded via data from plugins, you don’t need the plugin to access it.
Players that would enjoy contributing to it only need to setup Dalamud and install Remote Party Finder.

Raid Simulator

https://xivsim.com/
Practice game/raid raid mechanics with your raid group.

Market Board

https://universalis.app/
Crowd sourced marketboard information for FFXIV