Untouched Nature (UN) is a very big and complex mod that makes Minecraft look and feel a bit different and much more realistic, encouraging players to explore completely new lands, learn new things about nature and perform different kinds of magical actions.

Dependencies

UN doesn't have any dependencies except minecraft forge, but there are some optional mods, that are required for the full functionality of this mod:

Patchouli for guide books (UN adds 4 books as in-game wiki)
CTM mod for CTMglass

Highly recommended mods to use with UN:

Nature Compass, because there are a lot of big biomes
JEI + NEI for looking into creative inventory tabs for all the stuff UN adds
!!! Not enough ids mod, because installing UN with another big mod or many small ones will lead to lack of ids !!!

Compatibility (work in progress)

Theoretically compatible with other biome mods, that use Default world creation type, not custom one (you may need NotEnoughIds-like mod, if there will be not enough biome ids though).However, if the biome mod use it's own biome layout (GenLayers system), they will conflict with each other.The workaround is to disable UN custom worldgen and leave only vanilla biomes decorations.

Solution (tested with RTG, may need some further testing for another mod)

Set "Disable all custom biomes" to true in the "custom_biomes" config section.

Set "Use vanilla biomes worldgen" to true in "vanilla_biomes_trees" section.

Restart the game (if you used ingame config) and create a new world with RTG.

The result:

RTG landscapes with UN trees and all necessary stuff spawning.

UN has compatibility with BetterFoliage (for leaves), partial compatibility with Pam's Harvest Craft ore dictionary tags and all mods, that use this system, like Cooking for Blockheads.
Do not try using UN with my BiomeColorizer mod, because they both use the exact same system for changing colors, and the result may not be good
! Compatibility for crystal reconstructor and other modded trees is questionable, it depends on how another mod coded it's leaves.

List of features

P.S. Screenshots may contain hints about the creation process of many things !

World generation

Untouched Nature shows the possibilities of Minecraft 1.12.2 worldgen in its real beauty: no custom noise patterns or smoothing, only vanilla tools, but artistically used.

NOTE: Almost every part of worldgen is configurable! You can get rid of all custom biomes and flora, without losing important stuff for crafting; you can use custom UN terrain with only vanilla biomes, or use vanilla biomes with UN trees, or even make a completely vanilla world with all important stuff still spawning! The world can be whatever you like.

Vanilla-style configured world

Most trees and plants in UN are real ones and are carefully and naturally destributed in the corresponding climate zones. Biomes from different zones are separated by rivers to prevent unnatural look.

UN replaces vanilla logs and leaves in the world (only in custom trees), it's needed for the full-tree chopping and new leaves decaying rules (configurable).Trees will drop vanilla blocks when chopped!

Saplings for UN kinds of oak, birch and other vanilla trees can be converted to the original ones and back.

UN logs can be converted to the closest vanilla ones using the convertation catalogue. It may be useful, if you hate clutter in your inventory and storage system.

wider and more consistent rivers and beaches
world generation overhaul: new landscapes and a bit more complex biome spawning system
full vanilla biomes alteration
>50 new biomes
> 100 new types of trees, including small flowering and fruit trees with different models
= more than 500 hand-made trees + custom structure format and spawning system, that allows to spawn objects without getting "cascading worldgen" issues
10 berry and 7 flowering bushes of various forms
>90 real-world plants for every climate zone, also epiphytes + high grasses + moss + water plants + bigger plants with custom models
9 new mushrooms + 4 big magical mushrooms
15 new vines
14 new crops + wild potato, carrot and beetroot plants
3 new types of stone (black, white and red)
24 new fruits
18 new berries
6 magical crystals
10 new jewels ores + salt

Preview of some worldgen features

Ores

Crystals

Waterplants

Crops

Mushrooms

Big shrooms

Peat, clay and fir podzol

Advanced cooking

Meet new tastes! A lot of meals from all over the world are here for you.

new natural food sources: berries and fruits, vegetables and herbs, caviar, tasty flowers, seaweed, salt, mushrooms etc
firepit cooking for many types of food
"machines" for more advanced ways of preparing food: millstone, cooking pot, presser, juicer, fermentation clay vessels, large traditional stove + casting iron kitchenware, jars for pickling and jams. etc
new types of food: complex large meals with several uses, pastry, pickled vegetables, jams and juices, alcohol and vines, sauces, oils and flour
kitchenware and casting molds system

Preview of some features

Wines

Sauces,oils and flour

Kitchen utencils

Stove

Pastry

Juices

Jams

Simple food

Firepit cooking

Cooking pot food

Basic Manufacture

new sources of fibre and yarns: cotton, cotton grass, kapok, linen and silk
cloth, wool and string production using spinning wheel and loom
traditional sericulture (based on Chinese one)
compost bin for making bone meal from vegetation
stone worker's table for crafting stone decorative blocks
glass worker's table for crafting exquisite stained glass blocks
window factory for making different types of windows
painting machine for changing colors of blocks
freezer for making ice

Devices

Instruments

a few new basic survival tools like stone for beating things and throwing, stone knife, lighters from simple materials, scythe and leaves blower, crystal reconstructor for getting saplings

New materials, fuel and mob loot

Bamboo, peat, straw, branches, raffia and liber, palm leaf, moss, cattail and papyrus for paper, pearls and shinyphere orbs, new dyes and paints
Wither fork bone, horse hair lock, sheep stomach, creeper skin, witch hair, cat hair (some of them need special tools to be obtained)

Loot

Storage

cute clay jars of all colors
bamboo chests
bureau
big wicker basket that stores its inventory and can be taken when you're travelling far

Storage blocks

Decorations

Stained glass
Lots of new wood and planks blocks, including stairs and slabs+vertical slabs
Colored glass windows (blocks and panes)
Fancy glass blocks+CTM glass
Carved terracotta blocks
New colored terracotta blocks
Jewels stone blocks: semi-transparent jade, malachite, new lazurite blocks, colored marble, amber, beryl, chalcedony, garnet, jasper, hematite, rhodochrosite, saphire
Wallpapers
Curtains
Fences
Lattices
Hut logs
Straw blocks
Bamboo blocks
Wicker blocks
Flower bouquets
Flower pots
Pearl hangings
Light sources: chandeliers, candles, candelabra, lantern etc
and more

Preview

Stained glass

Colored glass

Carved terracotta

Terracotta

Curtains

Bamboo blocks

Candles and lanterns

Wallpapers

Lattices

Marbles and stones

Pots with tropical flowers

Bouquets with flowers

Hut logs

Alchemy, witchcraft and magical rituals

Completely different and complex potion making system, some alchemy basis and rituals based on giving sacrifices to ancient gods, their symbols in astrology and witchcraft. Feel yourself a Harry Potter! ;-D

Witchcraft room and hall with magical things

NOTE: You will now need medical or magical stuff to cure poison etc, because milk curing is disabled.You can enable it in the config!

magical (and existing) devices: distiller, extractor, cauldron, alchemist's table, herbalist's table, magical plants grower
circle runic rituals for crafting things
magical tools and weapons: staffs and amulets (maybe an invisibility coat too?..)
19 new potions
essential oils, extracts, tinctures and infusions
new types of magical ingredients: roots, bark, herba, flowers, berries, leaves, seeds, powders
6 magical crystals
new metals, that you will be able to transmute from vanilla ones
medical stuff
some magical instruments
some magical loot from mobs
garlic garland to protect from vampires (hmm, vampires?..)

Preview of most features

Alchemy

Distiller

Extractor

Amulets

Infusions

Ingredients system

Potions

Powders

Ritual on fire

Magic tools

Tinctures

Simple potions

Normal biomes

Plains

Extreme Hills

Forest

Swampland

Birch Forest

Roofed Forest

Extreme Hills M (Grassy Highland)

Swampland M

Willow Ponds

Wet Forest

Old Oak Grove

Temperate Fir Forest

Grasslands

Light Taiga

Schrublands

Redwood Forest

Rolling Hills and Meadow

Grand Fir Forest

Lush Grove

Aspen Grove

Steppe

Sunflower Plains

Rocky Hills

Flower Forest

Boreal biomes

Taiga

Mega Taiga

Mega Taiga Hills

Coniferous Mountains

Boreal Autumnal Forest

Taiga Highlands

Taiga Fjords

Wicked Lands

Taiga M

Mega Spruce Taiga

Warm (Mediterranean) biomes

Poplar Grove

Warm Mixed Forest

Warm Meadow

Warm Pastoral

Fairy Forest

Warm Dry Hills

Poplar Terraces

Poplar Grove Hills

Warm Mountains

Tropical biomes

Jungle

Mushroom Island

Mangrove

Equatorial Rainforest

Tropical Paradise

Desert biomes

Desert

Desert Mountains

Savanna

Hot Flowering Hills

Hot Grove

Hot Mountains

Desert M

Lush (Asian) biomes

Lush Mixed Forest

Lush Autumnal Forest

Lush Hills and Valley

Japanese Maple Forest

Lush Peaks Bamboo Pass

Lush Needle Peaks

Icy and Snowy biomes

Ice Plains

Ice Mountains

Cold Taiga

Ice Spikes

Ice Grove

Winter Forest

Winter Fir Forest

Winter Dead Taiga

Winter Tundra

Winter Hills and Valley

Winter Crimson Forest

Cold Taiga M

Wild West biomes

Mesa

Dry Golden Cottonwoods

Dry Prairie

Cypress Swamp

Red Mountains

Mesa Bryce

Some things to know before playing

You need to have a decent PC with at least 4GB RAM (allocated for Minecraft)
UN replaces some vanilla textures (waterlily and red sand&red sandstone blocks), as well as vanilla biome colors (configurable)
The very first load of the new world (initial world creation process)can take a while, highly depending on how many big trees are near the spawn area; after that this world chunk loading will have a normal speed.
UN adds a useful food testing tool, potion that makes player 100%hungry, named Hungry Belly potion.You can find it in the creative Brewing tab.
UN adds new harder recipe for bread (can be cooked in the stove) and removes milk healing effect (configurable)
Hand-made UN trees have custom leaves, which have their own decaying rules, and they sometimes may not decay properly due to strange minecraft block-updates issues.In most cases they will update and decay after any neighbor block will be updated.
Also all UN trees (not the small fruit trees with thin trunks) can be fully chopped down by an axe (configurable).Remaining leaves will decay after a while, or you can use Leaves Blower to remove them.

Technical Info:

UN uses custom system for loading and spawning structures like trees in the world.All these structures are made by hand and saved in a .tst and .btst templates- some kind of schematic-like files.They are formally text files, that game reads once during the pre-initialization phase and then saves in its memory.It means that you will need quite good PC and at least 4GB of RAM to load a game.Also the structure spawning system prevents trees (rocks etc) to overlap each other and landscape, so on the world creation it will take quite a while for the system to calculate and prevent intersections and cascading worldgen issues.This will happen only during the very first load, and highly depends on how big trees are in the spawning area.It however saves further performance for smooth gaming and didn't show any freezing or lags while playing.

History and future of the Untouched Nature

You may find UN a bit similar to my older project, OTG preset Traveller's Dream, and it is true =) When I started UN a few years ago, I wanted to make just a small simple mod, like an addon to TD, with some new blocks (logs, leaves and flowers) to use in a preset.However, I got so captured away by new possibilities as a mod maker, that decided to make this project a totally separate one, and so the UN was born.
I have very busy times during these years, so the day of the release happens only today.UN is a giant project, that gave me a lot of fun and teached a lot, and now it is finally out!
As this is a really big mod, more likely there will be no updates to newer Minecraft versions.That however is not a 100% final sentence.
Currently I'm much more interested in new ideas, new horizons for me.New Minecraft versions may give birth to a new project, if everything will be on my side=)

Translations

UN is currently available in :

English
Russian

If you want to translate UN to another language, you are very welcome! Visit my github (you can find it in the issues sections), there is all required information.

Screenshots were taken with :
Thaumcraft
Cooking for Blockheads
Better Foliage
Optifine
Shaders: Seus renewed v1.01 or Sildurs Vibrant v1.29