Satchel
Avicennia_g

Attempt at adding a formspec-less inventory interface.

Compression
The4spaceconstants

Uses compression_api to generate compressed nodes.

Compression API
The4spaceconstants

An API that provides functions to procedurally register compressed versions of nodes.

Diggable Chests
Kimapr

makes chests, furnaces and such diggable even if not empty

No Melterns, no tools
InfiniteCoder01

You can't craft tools without melters now. Progression becomes harder

Inventory Overflow
monk

If main is full, place nodes into the next available inventory

Virtual Key
louisroyer

Adds virtual keys registerers.

itemshelf (Fork)
nac

Generic item shelf with 3D items on display

Ocular Networks
mt-mods

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

Keyring
louisroyer

Adds keyrings.

Complete and Total Lua-Only Inventory Rewrite
Noodlemire

Creates a completely custom inventory system, which doesn't rely at all on any of the usual UserData objects.

Item Tracking
Impulse

Provides a API to mod developers to track which inventories items are in.

Forgotten Lands
jordan4ibanez

Lands that someone forgot.

Warning: Non-free media.

Emerald Bank (MineClonia)
N Freeman

Keep your Emeralds in a Bank, a complete economy API