Below are tools I created when I couldn't find them existing online. Choose the one you need.
Roll on the Treasure tables from the Dungeon Master's Guide and Fizban's Treasury of Dragons
Treasure Tables
Generate the contents of a shop
Shop Creator
Create a disguise for your character, or even a random look for an NPC
Disguise Self
Check the overlap of spell lists or exclusive spells for spellcasting classes.
Spell Overlap
Random Vicious Mockery or Healing Words.
Vicious Mockery
Drow Name Generator
Names