Quote fromI find them demotivating. I'm a strong believer in the user's right to play around with and modify games they've bought, so I'm not going to do anything about them. But a lot of them have the potential of encouraging or enabling piracy, or making griefing easier in multiplayer.
Notch frowns upon you. And no, they don't exist, yet, not to my knowledge. You just want a client so you can play without going to your browser? Hax would tear up the generation system, not to mention your computer.