Paint Brush tool:
Can apply by painting color, texture, or retouch operations (depending from the current edit mode).
Clone tool:
With this painting tool you can copy a source picture over a target picture
Objects Stamp tool:
This allows you to paint with objects.
Deformer tool:
Warp tool, lets you deform pictures.
History tool:
This tool restores by painting a picture stored in the undo buffer.
You can control all the parameters and settings of the selected tool by the tool window (example of tool window when the paintbrush tool is active):
