MultiMC

MultiMC is a free, open-source launcher for Minecraft. It allows you to have multiple, separate instances of Minecraft (each with their own mods, texture packs, saves, etc.) and helps you manage them and their associated options with a simple interface.

Features

• Manage multiple instances of Minecraft at once
• Start Minecraft with a custom resolution
• Change Java's runtime options (including memory options)
• Shows Minecraft's console output in a colour-coded window
• Kill Minecraft easily if it crashes / freezes
• Custom icons and groups for instances
• Forge integration (automatic installation, version downloads, mod management)
• LWJGL version changing built-in
• Supports every version of Minecraft that the vanilla launcher does
• Multi-platform (OS X, Linux, Windows)
• Multi-language
• Multi-themes
• Multi-Minecraft-account management

You can switch to the development version in the settings to get newer, not-yet-released features.

• MultiMC now has FTB integration:
  • Official and third-party modpacks work.
  • Codes for private modpacks are not implemented yet.
• Version lists now show release dates where available.
• New instance dialog:
  • It has been completely overhauled and now uses the same kind of paged dialog design as the rest of MultiMC.
  • Vanilla version list now has a filter for version types.
  • FTB integration gets a page here, along with zip import and vanilla.
  • Technic integration is a definite possibility in the future.
  • If there is a decent way to list Twitch modpacks, proper Twitch modpack integration is a possibility too.
  • There still is no modpack updating. Much more work is needed for that.
• Other Logs page:
  • Now has a search bar, just like the main log page.
  • GH-604: Uses the same font settings as the main log.
• Icon selection dialog now has a button for opening the icons folder.
• MultiMC now has a shinier, updated logo.
• GH-2150: Custom commands have been split from the java settings into a new page.

  The use of variables in custom commands is now better documented. The label shows that they need to be prefixed by $.

• Player name is no longer censored in logs.
• MultiMC now probes the system for the name of the linux distribution as part of analytics. This will be used to focus future packaging efforts.
• Secret cheat code has been added… What does it do?
• Bugfixes
  • VisualVM integration now works when VisualVM is bundled inside the MultiMC folder (uses a relative path).
  • When reinstalling a component, or changing a component version, the custom version is now removed first.
  • GH-2134: Fix multiple issues with the skin upload:
    • When uploading a skin, the model selection now works correctly again.
    • When the new skin file is specified using the file:// URL scheme, it will now work correctly.
  • GH-2143: Mojang services status display now reflects the current set of services.
  • GH-2154: MultiMC now ignores the hidden flag of instance folders and they should show up correctly.
  • When migrating Legacy instances, custom minecraft.jar will be preserved.