PyMCL Wiki

This is going to end up being a semi-long list by the time I'm done.
This list is based off of the current list from the version in development.

Launches Minecraft
Has an instancing system somewhat similar to MultiMC.
Has basic discord rich presence integration.
Is open source.
Fixed login.
A locally ran intercepting http proxy system to fix skins, sounds and capes. Uses the pymcl.net skin, cape and sound APIs.
Completely themable per instance.
A modpack repo to easily install modpacks.
Completely overrides %appdata% (or system equivalent) and forces ALL files created to the instance where possible. This fixes some mods reading from the default Minecraft folder.
Has an extended options panel.
Looks similar to the old beta launcher.
Modpack installation from partial jars.
Automatic sound download for missing sounds on installation of instance.
Automatic LWJGL download if missing.
MultiMC instance support.
Modpack export utility.