The List

XAT
Very useful for checking animations outside of launching the game.
Also practically required to make animations using blender!
Link: https://github.com/Etheirys/XAT

FFXIV Explorer
Extremely useful for finding different paths. The public official version is sadly missing a lot from its resource section. Namely after stormblood but you can find better filled out lists from other mod makers and even on different forks. Typically this is most useful for beginners and will end up rarely used by people who have done it for longer times but it remains useful throughout.
Fact its not a plugin is also quite the plus! Just remember to load file 040000!
Link: https://github.com/goaaats/ffxiv-explorer-fork