Mods

df are called total conversions, and mods that fix bugs are called unofficial patches.

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Harmful Mods and Mod Safety
Due to the fact that mods can execute almost any arbitrary code, it is possible a mod could deliver a virus, steal your account information, or cause other harm to your computer if the creator had that intention. There aren't many cases of this happening but it's worthwhile to look for community feedback about a mod before installing dit.

If you choose to trust a mod, make sure to download it only from its official download location. The nice guy putting up a fast mirror of YourFavoriteMod may have added a little extra something....

Mods can also inadvertently cause issues with your minecraft installation if they aren't properly made and can potentially cause issues to save files. Again, this isn't very likely with established mods, but it would be wise to back up your .minecraft folder or saves folder before using a new mod.

Multiple mods may conflict with each other; certainly if two mods need to alter the same files, then they are unlikely to be compatible and will not work.

Mods generally need to be run with the exact Minecraft version they are developed for; mismatched Minecraft/mod versions are unlikely to work. Even when updating both Minecraft and your mod(s) at the same time, there still may be issues with saved worlds, so it is strongly recommended to backup your saves before any update.

Outdated Mods
A full list of outdated mods can be found here.

Client Mods
Client Mods are modifications to your Minecraft program (Alpha or Beta). They are not custom clients, and require modification of minecraft.jar. Like high resolution textures, they only work with the launchers, and won't work if you play Beta through a browser.

The most common form of client mods are aesthetic and/or functional. However, some client mods add content to the game, and others fix issues with the game. While some do work on SMP, mods that add content, and thus  could be used for griefing, do not work, as the server will ignore  custom content.

Mod List
Note to people editing this page to post their own mods:

First, please put your mod in the correct section. If it adds new mobs, items, or blocks (or dimensions), put it in New Content. If it changes features of an existing item or adds settings, like adding a new difficulty level or making mobs drop more experience, put it in Aesthetic and Functional Mods. If it fixes a bug in "vanilla" Minecraft, put it in Fixes. Second, please keep the mods in alphabetical order. It's much harder to find older, established mods when they are buried beneath the mods that have been thrown on top of them.

Thank you for following these simple rules.

APIs and Loaders

 * For a list of Outdated APIs/Loaders, see here.

Fixes

 * For a list of Outdated Fixes, see here.

Aesthetic and Functional Mods

 * For a list of Outdated Aesthetic and Functional mods, see here.

New Content
Any mods that add new blocks, items, or mobs will have new Data Values, which can be found on the Mods/Data values page.

For a list of Outdated New Content mods, see here.

Introduction
You have to delete the META-INF folder inside the file "minecraft.jar" and replace the files "en_US.lang" and "stats_US.lang" inside the folder "lang" in order to use a language pack.

You can find a complete installation guide for different operating systems on the Minecraft Forums.

As of snapshot 11w49a, language packs are obsolete, due to the official implementation of other languages.

Server Mods
Server Mods are modifications to the official Minecraft server software. They generally fall into two broad categories: management and gameplay.

Management mods are commonly designed to make administration of servers easier by implementing tiered privileges for commands (such as kicking, banning etc.). They are frequently implemented as "wrappers" which do not actually modify the main server .jar file, instead monitoring its output and sending commands to it.

Gameplay mods are modifications to actual game mechanics, such as restricting the placement of blocks commonly abused by Griefers (e.g. lava, TNT), fixing bugs in the server (e.g. making furnaces function before the update of 10th of September 2010) or adding new gameplay features.

Mod List
This is a list of wrappers and modifications. For server mods for out of date versions, see here.

Server Operating Systems
Server OS'  are often Linux distributions specifically built to host a Minecraft server.

They are built to ease the burden for Minecraft server administrators by providing tools to manage deployment & maintenance.