If you cannot find a free pack that suits your needs, the best solution is to build your own. This is 100% free and often yields better results than pre-made assets.

The oldest trick in the book still works. In modded environments that include unnamed enchantments, fishing is universally coded as a "free" loot generator. You need:

How it works: When the fishing loot table is modified by a datapack, the "minecraft:enchantment" tag can roll "unnamed" variants. Because you are not spending materials to craft the rod or the enchantment, this is 100% free. Pro tip: Build an AFK fish farm (a simple note-block-and-iron-trapdoor design) to generate dozens of enchanted books overnight, increasing your odds of landing an unnamed variant.

The Elder Scrolls V: Skyrim and Morrowind have thousands of enchantment mods. On Nexus Mods, check the “Free” license filter. Popular free packs include: