Sling
tacotexmex

Sling enables item stack and single item throwing of any item.

L-System Tree Utility
Wuzzy

A form to easily spawn L-system trees, aimed at mod developers.

World Borders
argyle

Add impenetrable barriers to the sides and bottom of the world.

Respawn Kit
Deadlock

Adds a "respawn-kit"-Chest. A Copy of everything you put in it, will be given to you on respawn. (With configurable Black/White-List)

My Wood Slopes
Don

Make slopes with wood blocks.

Slot Machine Mini-games
mt-mods

Provides an "engine" to drive simple slot machines (includes two). Spins reels, takes in/pays out in Minegeld (Dan's currency mod), etc.

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

An API for automatically registering recipes, nodes and ore generation.

Geodesy
SFENCE

Geodesy tools and items

timehud
bookgirl

Minimal HUD timer API

Sneeker
AntumDeluge

An explosive nuisance.

NodeCore Bugs
Winter94

Adds A Variety Of Bugs To NodeCore

Mine
SkyBuilder1717

Adds many types of mines

My Stacks
Don

Changes the max number of items in each stack

Show bones
ExeterDad

Saves bones positions to a file

afk_api
fluxionary

an API for registering events which trigger when a player goes AFK or comes back from AFK.

Players Effects
SFENCE

Provides predefined attribute effects for players ncluding movement, vision, and brain concussion effects. Apply logic is not included.

Teleport Anchor
1F616EMO

Fixed teleport destinations for survival players or adventure map makers

Explosion proof obsidian
Miner34

Adds an explosion proof obsidian.

Cthulhu eye boss
Giga_M

Cthulhu eye boss adds

Tune JIT
rudzik8

Tunes LuaJIT parameters to improve server performance by preventing constant GC

This should be make sense!
1F616EMO

Adds missing crafting recipes that should exist

Toggle Privs
bugbug11

Allows players to enable and disable privileges granted to them

PvP Control
mike.monkeybiter

Allow players to set their own ability to hurt or be hurt in PvP, by chat command or by pressure pads. Nametag colour changes to reflect status.

Enchantments Workbench
bgstack15

A workbench for enchantment operations

itemshelf (Fork)
nac

Generic item shelf with 3D items on display

Minetest Emotions
ResendeTech

Adds new feelings in the form of blocks

Fake Solids
Holly Mae

Creates fake blocks that can be walked through.

LocalChat
qPexLegendary

Adds local and global chat

Scripted World Editor
Neuromancer

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

Classic Coaches Nationality Livery Pack
Marnack

Additional nationality themed liveries for use with the Classic Coaches mod.

New Flowers
LLL4001

This brings more flowers to the base game.

Guider
1F616EMO

HUD markers for navigation

Uncraftable Recipes
ReinPlayz

A small mod that adds shapeless recipes for lava, water, river water source blocks, and grass block.

action queues
fluxionary

provides an API for queuing things for batch processing w/ various ways to specify the batch "size".

CTF Info
Jo5629_

Know what is happening in CTF in your world.

Top players
Giga_M

Adds a kill, deaths, and kd counter to players.

Frames
opfromthestart

Frames from Technic since it was removed.

Cooksneak
Kimapr

Smarter furnace shift+click behavior

Flowing Concrete
DumbDave961

Adds flowing concrete that hardens over time. Cheap alternative to lava cooling.

TerraContent Corruption
AirplaneMan

Adds the Corruption