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The AUNIS Mod by MrJake222, MarcelMPL

Stargate mod

The Adventure Mod by Naidru, MCreator

The Adventure Time Mod by Smiley38, LTUGamer210

Adds new mobs and items from the show.

The Aerilon Legacy Mod! by legodamen, MCreator

The Aerilon Legacy Mod intends to give the game a more fantasy feel, and accomplishes this via unique items, weapons, tools, blocks, armor and biomes. The mod is based off of the Aerilon Legacy CIT pack, and is made in collaboration with the members of the Aerilon Legacy SMP.

The Aether's Baubles by Henrykado

The Aether and Baubles compatibility addon.

The Agricultural Revolution by Mr_Moeman, NotSoSpartan

Lots of extra cooking, farming and gathering stuff.

The Andrew Mod

A mod where anything can happen because it's so random.

The AntiToxicity Mod by Slackow

A mod designed to block unwanted chat messages with ease

The Apiarist Terminal by contributors

OpenComputers drivers for Gendustry machines (e.g., Advanced Mutatron component: advmutatron).

The Aurorian by (Elise)Elseytd

Explore a land beyond this world, bathed in moonlight and shrouded in nature.

The Auto Login Mod by ATE47

I haven't your time.

The BOM Plugin by osum4est

A plugin for JEI that lists components needed to craft complex items and blocks.

The BackWoods by Chaka15205, Christophernjsp

All The Comforts Of The Outdoors in One Little .jar!

The Backrooms by LudoCrypt

The backrooms... but... in minecraft? a unique survival challange