The last tool of mine is a FF randomizer. It's a kind of tools that quickly refreshes the game by randomizing some of its content. That's a bit popular in the speedrunning scene where there are already runners taking a break on randomized versions of other Final Fantasies (I discovered it myself with FFX, as there's a tool for randomizing the sphere grids).
The spells are randomized among the spells used by the party in the vanilla game. For instance, Vivi can get Stock Break or Dagger can get Doomsday.
The weapons and armors also teach random abilities.
Another thing it can do is randomizing both the cards that the enemies drop and the cards used by the opponents during Treno's tournament.
Here is the download link :Meteor On Final Fantasy IX
It only works with the american version of the game. Don't forget to apply the changes on all the 4 discs !