Minercantile
Mathias

Economy featuring a primitive supply and demand system for exchanging goods.

Player Speed
Boot

Displays the player's speed (walking, running, falling) in m/s and km/h in the HUD.

Thruster
DarkXWolf17

Propel yourself through space with this new invention. Zero-G recommended. Check settings for tweaks.

sfinv++
swagtoy

Improves the inventory, and fixes some formspecs throughout some mods.

GetName
kevins

Adds an API and tool to generate random names for NPCs, mobs, and places.

Saphire
Ryft77

Adds saphire stuff

Leather Armor
X17

Adds an armor made of leather

crouched
Giga_M

the player crouches

More Upgrade Packs
nolombic

Upgrade your upgrade packs so you can have even higher stats!

Decraft
iarbat

De-craft items with the decrafting workbench.

Scraps
Goops

Allows to recycle metal tools

Quartz New
alerikaisattera

Quartz and quartz glass building blocks

Zughy32 colored blocks
MisterE

Plain colored blocks from the Zughy 32 palette.

Better Roads
DragonWrangler

allows players to make roads with less jagged edges

My Mulch
Don

Turns leaves and other items to mulch blocks

Engravings
Taren

Adds multiple engraved blocks and benches to make them.

Renewable Fireflies
mecha_moonboy

Registers an ABM on some ground blocks that spawn fireflies if certain criteria are met.

My Torches HD
Don

Changes default torches to ones that burn out and cause damage

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

New Biomes
Arkatron

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

3D Armor Mobile
LandarVargan

Adds a command to bring up a formspec that allows mobile users to put on armor

LDF Race And Parkour
lister

Race/Parkour Timers and Record Tables

Tac Nayn
GreenXenith

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

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Aqua World
NovaX

Generate an underwater world with deep water, sand, and sandstone.

Useful Contraptions
theFox

Some useful contraptions / machines.

Gates (wider)
Sokomine

Wide gates for easy walking through and keeping cattle inside

Basket Cooking
1F616EMO

Cook all stuffs inside a basket with electric furnaces

Blood Bane Sword
Blocky Player

OP sword for moderators. In memory of an old teacher, who had a mod similar to this on a private server.

Uncrafter
JoeEnderman

Adds an uncrafting table

Advanced Biome Decoration Modpack
EmptyStar

A collection of advanced biome decorations

Lava Particles
karlexceed

Adds some spark particles to lava pools

BitChange
Krock

Money items for your world. You can mine bitcoins. Sort of.

Item Holders
Jose_ManuelS18

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

Node roads
MatyasP

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

Cthulhu eye boss
Giga_M

Cthulhu eye boss adds

Mesecons Stealthnode
Clyde

Register your own Ghoststones.

Hoverboard
mazes

Hoverboards

Unified Hammers
Linuxdirk

Various hammers that can be used to crush nodes.

Ubertool Mod
HartRend

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