Heaven Chronicles / Zones of Thought
Per a 2008 letter from Joan Vinge (more information at the link):
The "Heaven Belt" future history is unrelated to either the Cat books or my "Snow Queen" series. Instead, the "Heaven Belt" stories are linked to the "Zones of Thought" series created and written by my former husband (and still friend), Vernor Vinge.
...
...the whole "true story" behind the evolution of the book will at last be told, in a (nonfiction) Afterword to the book, explaining some heretofore unrevealed mysteries linking the original Outcasts of Heaven Belt with Vernor's "Zones of Thought" novels.'
No titles found in this series.