This will be my second time doing the LD compo (fourth if you count minis).  I’ll be using:

Unity(C#)

GIMP and/or iDraw and/or Pixen

Blender

CrazyBump

TexturePacker

cfxr

As far as code libraries, I will probably end up using my SpriteSheet class, which is available here.  Feel free to use it if you like, but be aware that it is buggy and not very versatile.