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Arcanery by Waterdude

Magic mod with branching progression and MMO style inputs.

Arcania by DiabolusNeil

Adds wands which you can apply modules to, enhancing their base power. Since this is an Alpha release, please report any and all bugs to the Minecraft Forum page.

Arcanum by HellBreecher

Make your minecraft experienced all the better!

Archaeology

Archaeology mod for Minecraft

Archani Commutatio by Xetosphere

The Archani Commutatio mod.

Arche by Jason_Anaminus

More Philosophers Stones

Archimedes' Ships by BalkondeurAlpha

Craft and create your own ship... And sail it across the seven seas!

Archimedes' Ships by BalkondeurAlpha

Craft and create your own ship... And sail it across the seven seas!

Architect by Sangar

Make building repetitive things easier.

Architect's Friend by TheBrazillianForgersTeam, TheFreeHigh (Code), Armelin (Textures)

Pixel Arts, Big Builds, doesn't matter. With Architect's Friend you can build it!

ArchitectureCraft

Distinguished architectural features for your Minecraft buildings.

Archmagus by Agadar

Archmagus is a Minecraft mod which adds a variety of obtainable spell books to the game.

Archonia by Grand_Opal

Adds many features to you world to become more mystical.

Arcrops by IrresoluteArkia

Adds a few crops to make life easier :)

ArcticMod

A mod with 100+ Mods including 30+ New mobs,25+ wepaons and many unique blocks.