Credit to TangoTek for the Improved villagers mod.

this mod pack includes a couple of other mods to enhance the experience of the mod

Features

- Complete village overhaul! You build the village and your villagers adapt to your designs!
- Build a massive village with 100+ villagers all working in harmony
- Sell your villager products to the wandering merchant for emeralds!
- Use the emeralds to expand your village with new structures and acquire new villager professions.
- Protect your village from the evil Necromancer and his summoned army of minions!
- Over 20 different villager professions and 18 unique structures!
- In depth leveling system for your villagers involving education and training.
- Powerful custom pathfinding system allows your villagers to path hundreds of blocks with no added overhead!
- Male and Female versions of all villagers.

The Villagers

You choose the professions your village needs most!

Bard - Plays music and entertains others villagers increasing happiness
Blacksmith - Crafts iron and diamond tools, weapon, and armor for your villagers
Butcher - Slaughters animals and harvests meat
Chef - Creates a wide variety of foods to keep your villagers well fed
Cleric - Heals and blesses other villagers
Druid - Helps grow crops and trees as well as replenishes your mineshafts
Enchanter - Enchants weapons, armor, tools and books
Farmer - Tills soil, and plants and harvests crops
Guard - Patrols the village keeping the village safe from invaders
Captain - Captain of the guard that inspires other defenders
Lumberjack - Villagers need wood. He's your guy (or gal!)
Miner - Travels deep below the earth digging out mineshafts and bringing back valuables
Rancher - Feeds and harvests animals
Teachers - Educates your childen so they can be more skilled professionals as adults
Child - Attend school and play with other children
Nitwit - Your average, unemployed bum ;-)
Nomad - Visitors come to your village looking to join
Merchant - He wanders into town daily. Trade your villager's goods for emerald profits!

The Structures

Unlock your villager's potential with your own custom structures!

Town Hall - The heart of your village where you buy structures and new profession tokens
Storage - The central hub of all villager goods. A busy place!
Home2/4/6 - Homes for your villagers come in various sizes
Mineshaft - A tunnel below ground where Miners dig up valuables
Smithy - Where your blacksmith can be found clanging the anvil and crafting things
Cow Pen - Ranchers can raise cows and collect buckets of milk
Sheep Pen - Ranchers feed the sheep and shear wool
Pig Pen - BACON!
Chicken Coop - Ranchers will tend to the chickens and gather eggs
Butcher - Your butcher will bring animals back here for...collection.
Kitchen - The chef works her magic here cooking all sorts of delicious meals
Tavern - Villagers need to party it up! And they will do so here at night with your Bard!
Library - Smart villagers are skilled villagers! The library is critical to skilling up your citizens
School - Teachers will educate your children here and give them a massive boost that will help them as adults.
Guard Post - Guards will patrol these points, keeping an eye out for unwanted visitors.
Barracks - Your guards will sleep and train here
Merchant Stall - The Merchant will hang around here, awaiting your trades.