MineClone 5
kay27

A fork of MineClone 2 with no release milestones, rapid delivery, merges by one approval and no MC target version limitations. But technically it's still MineClone 2.

Mineclone2 New Ores and Deepslate
NO11

Adds 30 new deepslate blocks!

Loria (alpha)
siegment

Survival in hardcore acid-alien sci-fi themed world

Mineclone2 Copper
NO11

Adds Copper Ore, blocks and items.

KSurvive
MadKamel

A game that changes much of MTG's gameplay.

Multiple Biome Generator
chaosomnium

230 Pseudorandomly Generated Biomes, Trees, Fruits, Ores, Tools, and Liquids

Placeable Buckets for Catching Rainwater
Noodlemire

Allows empty buckets to be placed as nodes in order to collect rainwater.

Research N' Duplicate
Noodlemire

Obtain and research enough of a specific item to unlock the ability to infinitely duplicate it.

Ropes
FaceDeer

Adds rope boxes of various lengths and also rope ladders.

Falls
Just_Visiting

A Particle-based Waterfalls/Lavafalls Mod

Portal gun
AiTechEye

Portals and stuff

Voxelgarden
Casimir

A game for exploring, survival and building

Better Ice
TheFanne

Modifies ice so that it melts into water when broken, and will be melted by torches

Plastic Box
Starbeamrainbowlabs

Adds a recolourable plastic box. Fork of @cheapie's version with improvements.

You Can't Touch It Either
Avicennia_g

Simple mod adding lockable storage shelves to Nodecore.

Poly Decor
PolySaken

My spin on decorative stuff.

Ocular Networks
PolySaken

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

Antipyre
Warr1024

Safety net against falling off your island

Base Modpack
karlexceed

This combines several other mods that I consider a basic minimum starting point for worlds.