- Make mod installation really easy with a "one-click" installation mechanism.
- Let server owners send mod packs to clients with a versatile update mechanism.
Screenshots



In addition to installing mods:
- Easily change Java RAM usage options and other game-related settings.
- Switch between multiple Minecraft accounts and remember their passwords.
- Switch between different configurations, each with different settings.
- Switch between different .jar files to run, each with different lists of mods.
- Quick to load, clean news display. Can be disabled anyway.
- Quickly connect to servers you use by right clicking the Play button*.
- Supports updating Minecraft, downloading only files that were updated.
- Having problems? Open the console and view error messages. It won't close if Minecraft dies.
- Supports digital signature verification for everything, making sure all the files you download with the launcher were not tampered with.
- More options to be found in the options dialog.
- Open source! Don't trust some Internet person giving you a launcher? Compile it yourself.

Download
Warning! Google Chrome and (newer) Windows versions now check downloaded .exe files to see "how many other people have downloaded this .exe." Since this download is re-compiled whenever the source code changes (and that can be often), you will always get a warning. Either ignore the warning (if it's "SmartScreen," click "More info" and then "Run Anyway") or use the Linux/Cross-platform .jar below.
Mac OS X .app
Linux .jar (cross-platform version)
Find the source code on GitHub.
Talk to sk89q on Twitter.How do I install a mod?
NOTE: This mod installation mechanism does not work as well as it used to. It will be changed with a less "magical" system soon.
Open the "Addons" window, click "Install...", and select the .zip or .jar that you have downloaded.
- This works for most mods, but if a mod doesn't work, please post about it here.
- You may need to still extract files to your Minecraft folder for some mods.
- Be sure to put mods that are depended on by others (like ModLoader) near the top of the list.
- If a mod uses an installer, try the version without an uninstaller.
Technical Information:
- Mods are loaded on the classpath directly from the original .jar or .zip. All mod archive files are placed in addons/<jar name>/ within the Minecraft folder.
- For .zips where the .class files are placed in some sub-directory of the .zip, the files will be moved up (including any resources in adjacent folders) to be at root.
- Package sealing and package certificate checks have all been disabled.
- The launcher primarily works through a custom classloader that disables various class loading mechanics and uses some compatibility code to get ModLoader mods to load. This means that minecraft.jar is never modified.



















