In ST:TNG episode "Evolution", we see that Wesley's nanites are dropped off on Kavis Alpha IV. Do we ever hear of these particular species of nanites ever again (perhaps in sources other than the TV series)?
Memory Alpha doesn't give us much on this, basically what's below:
In 2366, nanites threatened the USS Enterprise-D with destruction of its main computer core during an experiment in the Kavis Alpha sector. After conflict with the crew of the Enterprise, and particularly the experiment's lead scientist Paul Stubbs, the nanites were relocated to Kavis Alpha IV, which Stubbs' influence had helped designate their new homeworld. The nanites left the Enterprise and began creating their own civilization on the planet. (TNG: "Evolution")