Android: If you're looking to pack more icons onto the Android home screen than the default allows, Multicon's widgets change the spacing, number and arrangement of your home screen icons.
If the default 4x4 arrangement isn't cutting it, you can switch it to any other combination of rows and columns up to 144 total icons per home screen—as you get close to eight columns the icons get real tiny, however.
One great feature in Multicon is that you aren't required to change your entire homescreen to the micro-icon view. Multicon works by placing multiple icon widgets on your home screen. If you want all the icons on your main home screen to be full size, just leave them alone. If you want micro-icons on your side screens add Multicon widgets in the density you desire to pack in lots of mini icons. It's nice to not be committed to an all-or-nothing icon resizing scheme.
Multicon is free and works wherever Android does.