>>25065503
Gospel of Thomas

>>25065503
Thunder Perfect Mind is GOATed.

>>25065503
Also, Pistis Sophia even though it's Pre-Nag-Hamaddi

Whole library

Thomas, Philip, the Apocryphon of John, and the Hypostasis of the Archons are the ones I've found most memorable. I recommend these translations:

Thomas:
http://www.gnosis.org/naghamm/gosthom.html

The other three:
https://gnosticismexplained.org/the-gnostic-texts/

Legend has it that the Gospel of Truth is very well-written in the original language, but even the most readable translation I've found of it for free online is difficult for me to parse. Still, it's interesting enough:
https://www.noncanonicalchristianity.com/the-full-text-of-the-gospel-of-truth/

If anyone has a preferred translation of it to recommend, please do.

>>25065724
Pistis Sophia was known by the public before Nag-Hammadi, but it was actually written centuries after the books of NH (especially Pistis' books 3-6).
It was probably the last great Gnostic book written before them dying for good as a religious movement.

>>25065503
Essential books to have a good grasp on gnosticism:
>Gospel of Thomas
>Apocryphon of John
>Hypostasis of Archons (aka The Reality of Rulers)
>Sophia of Jesus Christ
>Gospel of Truth
Also some other important books:
>Book of Thomas, the Contender
>Secret Book of James
>Gospel of Philip
Not actually important, but very interesting and mysterious:
>Thunder, Perfect Mind