"Niddhoggr" - cracked MultiMC 5 for Windows - the only OS that matters
by Another Anon - version 0.2
Updated to MultiMC 0.6.2. Built with Windows
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How to play: just put whatever you want as login and password, it should run fine.
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To replicate the cracking: follow MultiMC5's BUILD.md. When the source is downloaded, open the files RefreshTask.cpp, AuthenticateTask.cpp and YggdrasilTask.cpp. There, find and replace any instance of

changeState(STATE_FAILED_HARD, tr("whatever crappy error message was written here"));

with

changeState(STATE_SUCCEEDED);

save the files and then follow the instructions as usual.
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How it works: you're telling the program to give a "YES! GREAT SUCCESS! WINRAR!" message even if Yggdrasil calls your login/pass combination bullshit.
Multiplayer? Bugs? Skins? No freaking idea.

Edit: Skins don't work. There are no bugs so far except for you being poor. Multiplayer wasn't tested but sure as hell doesn't work