Knob
Cutters. These are very similar to the concave cutters
listed above, except that they have a spherical head, which
allows you to cut branches and leave a small hollowed out
scar. Very useful, but not as important as a good set of
concave cutters.
Folding
saw. This is a useful tool for cutting through branches
larger than the diameter of either concave or knob cutters.
Particularly important for working with big trees.
Small
scissors. These are great for working with really small
trees or really twiggy growth where it is hard to get larger
shears in close. These are a must have if you want to do
detail work on smaller trees.
Root
rake. A root rake is used to clear away dirt from the
rootball before repotting. It is used to gently comb out the
roots and to remove dirt.
Tweezers.
Tweezers have all sorts of purposes in bonsai, from pinching
back new growth and pruning to removing unwanted objects
from your bonsai. Most bonsai tweezers will have a small
trowel on the end, useful for patting down moss, sowing
seeds, and many other odds and ends.