Nanites used as protection against grey goo and other destructive nanomachines, possibly even used for law-enforcement (nanarchy). It is sometimes used to denote any form of benign nanotechnology in the environment.
- Blue Goo Ecologies
- Disassembler Swarms, Black Goo
- Goo, Golden - Text by M. Alan Kazlev, from Anders Sandberg's Transhumanist Terminology
A type of goo disaster, the strange name comes from an early Information Age hypothetical scenario. The idea was to use nanomachines to filter gold from seawater. If this process got out of control the result would be piles of golden goo (the " Wizard's Apprentice Problem"). This scenario demonstrated the need of keeping populations of self-replicating machines under control; it is much more common than grey goo, but also more manageable. Also Carbon Goo, Aluminium Goo, etc.
- Goo, Green - Text by M. Alan Kazlev
 A plague of bionano (non-drexlerian) goo; especially of strong biotic form. Green Goo outbreaks are (like Golden Goo) quite common, but easily managed, at least in those areas with good access to blue goo and equivalent.
 Facetious term for biological life spreading throughout the galaxy. c.f. pink goo.
 (archaic) The scenario of nanomachines or bio-engineered organisms used for human population control, either by governments or eco-terrorist groups (generally by sterilizing people through otherwise harmless infections).
- Goo, Grey
- Goo, Khaki
- Goo, Love
- Goo, Pink
- Goo, Shadow
- Limitations of Nanoweapons
- Nanoferon: Nanotech Inhibitors
- Spore Hunters