I'm looking to Download / Buy all of the publications that include any units for Eldar. I'm aware of a few, but am not really sure how to confirm if they are 'official' and/or 'up to date'.

Is there someone willing to give me a list of them all or show me where to find them?

Such as:
-All of the super-heavies / Titans
-Forge World characters and units (like Wraithseer)
-Formations / Detachments

THANKS ahead of time!