@BudSpencer @Svantovit Enoch is getting a lot of mention - for good reason. While only the Ethiopian Tewahedo elevate it to Holy Scripture, the Ancient World nigh unanimously regarded it as a sincere and earnest attempt at describing the pre-Diluvian world, and the conditions that brought it about - even if not so authoritative as Biblical texts.
On par with Enoch, I’d recommend The Wisdom of Solomon. It’s got probably the best single Messianic Prophecy (Wis. 2:12-20). It was sufficiently obvious, it directly led me to reconsider my thitherto Protestant Biblical position.
Those are the two big ones. But I also recommend The Psalter According to the Seventy as translated by Holy Transfiguration Monastery. While not at all Apocryphal, it matches Gospel references to Psalms better than Masoretic-sourced material.