The Worm That Walks: There are a number of cybershells which are made up of microbot or even nanobot foglets, all of which would qualify, here.  So, too, would some made up of somewhat larger modular components.  (Also embatil, of course, who are a collegiate intelligence made up of multiple serpent-like components, which are independent when they’re young. Mature embatil, by contrast, grow together, so they look like multiply braided eels.)