RoadKill;
Ninja_Dojo;
MaterialList;
TextureManager;
Red9;
CGMToolbox;
RiggingToolbox;
MatchPosTransform;
MatchVertexTransform;
sIBL;
LightersFriend.

I don't remember which ones I wrote or paid for so I will just give this list. Every time I open maya I use scripts. Would not be as efficient without them. I also write and take from other scripts to make my own windows and workflows. It saves clicking and streamlines work. Everyone should learn Mel or Python. Even just basic syntax knowledge allows you to do 10x more.