Additional Gravel
Hordeking

Adds overgrown gravel, similar to mossy cobblestone.

Tac Nayn
GreenXenith

Adds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).

New Biomes
Arkatron

If you like underground biomes, this thing is for you.

Pineapple
Neuromancer

Pineapple crop for tropical biomes

My Regen Chest
Don

Spawns items when opened and will not again for determined amount of time

bridgemaker
mike.monkeybiter

A refillable machine to easily create simple block bridges across caverns and valleys.

Anarglass
VerdiSchubert

Some kinds of glass nodes

Spectator Mode
jp

Allows you to watch other players in their 3rd person view.

Petards
IlzumiZeminori

Miscellaneous pyro things

Item Holders
Jose_ManuelS18

Adds 'Item Holders', blocks that hold your items in display, also provides a API.

Cannonballs
AwesomeDragon97

Launch explosive cannonballs at your enemies.

My Parkour
Don

Nodes for making a parkour track

Better Fences (1F616EMO Redo)
1F616EMO

Allow fences to connect to all nodes

Unified Hammers
Linuxdirk

Various hammers that can be used to crush nodes.

Sun Flowers
Hybrid Dog

This mod generates flowers which close their heads at night.

Node roads
MatyasP

Add much of one-node roads and crossroads, road bridges and slopes

Nextgen Compass
StarNinjas

A compass item which points towards the world origin.

Lighting Rocket
lag01

For temporary lighting large areas

My Blocks
Don

Special Blocks

Offline Phantoms
Kimapr

Players leave "phantoms" when leaving; other players can take items from those

Frames
opfromthestart

Frames from Technic since it was removed.

Weedstone Random Mod Thing
chaosomnium

Originally meant to be a simple electronics type mod inspired by redstones, I messed around with the code after getting bored and got this weird mod, and now it's this thing. Enjoy I guess?

My Rocks
Don

Places rocks around the world

My Lava Sponge
Don

Soaks up lava

Dirt Tunneler
Neuromancer

Makes dirt deeper and you can tunnel through it just by walking through it. Press spacebar/shift to tunnel upward/downward with auto placed ladders.

Nyancat's heaven (reworked)
Hybrid Dog

Adds a nyanland in the sky

Bedrock Markup Language
sorcerykid

Bedrock Markup Language is an extensible markup language and API for formspecs.

Hbdrunk
UnchainedDevelopment

Adds intoxication effects and HUD bar to display intoxication level.

Server Essentials
jolethen

An essential mod for any server

Tile Floors
ClassicAdam

Various colors of tile flooring in 16px and 256px res

Scripted World Editor
Neuromancer

API that allows you pass in scripting tables to fill a series of shapes of different sizes with different nodes

Ubertool Mod
HartRend

Provides a combination pick, shovel, and axe tool capable of extreme function. Tool is also illuminated.

Chat History
sorcerykid

Interactive chat history viewer with a variety of message filtering options

Ocular Networks
mt-mods

Draw power from the world, and use it to power machines and tools.

Good Sneaking
zempik10

Makes the player have better sneaking.

My Stacks
Don

Changes the max number of items in each stack

Cave explorer tool
SFENCE

Cave explorer tool to use acoustic signals for undergound exploring.

Fragments
Amaz

A mapgen with a goal, with things needed to advance to the next level.

Mesecons Stealthnode
Clyde

Register your own Ghoststones.

Time Stone
j45

This mod adds 2 single use stones, a day stone and a night stone, the day stone turns time to sunrise and the night stone turns time to sunset.