OpenEye

Difficulty Locker allows you to lock the difficulty of multiple worlds separably in versions pre 1.8 where this functionality has been built into vanilla

Difficulty Tweaks by Lothrazar

Adds a bunch of small tweaks to the game that are all aimed at increasing the difficulty of the first few days. You cannot punch trees; you must turn saplings into sticks, and sticks into a damaged wooden axe. All stone tools require smoothstone instead of cobblestone. Furnace requires one coal in center to craft (so you may not get a furnace or stone tools on your first day; try making wooden tools and finding food first). You cannot gather dirt, grass, sand, clay, or gravel by hand (you can still break them by hand, but need a shovel to harvest the block). Sleeping in a bed will drain your hunger down and also gives you the rotten flesh hunger effect.

Dig by Macrophage

Dig through blocks for resources.

Dig Craft by huajiliming

Dig, update your pickaxe, and dig advanced ore!

DigAllSMP

DigBedrock

You can Dig Bedrocks using Diamond Pickaxe

DigSpring

Diggy's Skyblock Additions by diogo, MCreator

Diggys Alphabet 2 by DiggyWig

Alphabet and number blocks in DiggyVerse style.

Diggys Doughnuts by DiggyWig

Tasty doughnut goodness!

Diggys Lights by DiggyWig

Makes lighting more flexible and interesting!

Diggys Mobs 2 by DiggyWig

Mobs And More To Enhance Vanilla!

Diggys Stuff 2 by DiggyWig

Blocks And Items To Enhance Vanilla!

Digimobs by Cyan

A Digimon Mod for Minecraft. Bringing Digimon to the Minecraftian Universe

DigitalXP

Store your experience digitally!

DilleronMod

For Dilleron. New Mob,Ingot and Armour

DillonsRollingWestern

This is a mod that adds many items from a 3ds eshop title.

DimList by Nep Nep

A mod to make a dimension list

DimReseter

Manages Monthly Dim Resets

DimSotage by Gaarnik

DimStorage add a technologic version of ender chest system with owner, frequence selection and lock system.

Dimen

This is an example mod

Dimension

This is an example mod

Dimension Atlantis by Mysticpasta1, Gami, LordHugo02, DTRaptor

An Underwater Altantis like Dimension Mod.

Dimension Hub by FatherToast

Creates a teleporting hub and unconventional progression through dimensions.

Dimension ID Getter by RiceBallSouls

Enumerate dimension IDs.

Dimension Inventorys by lumien

A small mod that allows you to specify which dimension share a player inventory and which have unique ones.

Dimension Locker by Monatann

Need items to enter the Nether and End.

Dimension Mod! by Little Master, MCreator

Hello and i have made a dimension mode it has some very good dimensions!

Dimension Music by Tmtravlr

Lets you change the music that plays in different dimensions, including modded ones. Also lets you play music in the menu. Put the music files in a folder 'DimensionMuisc' in the config file, in the folder with the number corresponding to the dimension ID (for example, the folder '-1' for the Nether), or the 'Menu' folder for menu music.