Requires the library mod Collective.
This mod is part of The Vanilla Experience.
Zombie Villagers From Spawner is a minimalistic configurable mod which puts back the ability for zombie spawners to spawn the villager variant, originally removed in Minecraft version 1.11.
You may also be interested in More Zombie Villagers.
Configurable: ( how do I configure? )
isZombieVillagerChance (default = 0.1, min 0, max 1.0): The chance a new zombie spawn from a spawner is of the villager variant.
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You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge ecosystem.
Serilum.com contains an overview and more information on all mods available.
Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!