MKW II

According to the most recent information that I can find on Wikipedia, here, MKW comprises:

The Man-Kzin Wars
Man-Kzin Wars II-VII
Man-Kzin Wars VIII: Choosing Names
Man-Kzin Wars IX
Man-Kzin Wars X: The Wunder War by Hal Colebach 
Man-Kzin Wars XI
Destiny's Forge by Paul Chafe 
Man-Kzin Wars XII-XIV
Treasure Planet by Hal Colebatch & Jessica Q. Fox 
Man-Kzin Wars XV
Freedom (e-book) by Hal Colebatch & Jessica Q. Fox

A start has been made at rationalization.

Poul Anderson's "Iron," from The Man-Kzin Wars, and "Inconstant Star," from III, have been collected as Inconstant Star and should be joined by Anderson's "Pele," from IX.

Dean Ing's "Cathouse," from The Man-Kzin Wars, and "Briar Patch," from II, have been collected as Cathouse.

Jerry Pournelle's & SM Stirling's "The Children's Hour," from II, and "The Asteroid Queen," from III, have been collected as The Children's Hour and should be joined by Pournelle's and Stirling's "In the Hall of the Mountain King," from V.

Since Pournelle's & Stirling's and Anderson's contributions cover the kzinti occupation of Wunderland and its aftermath, they seem to form a sequence with X, to judge from its title.

Larry Niven has said that "A Darker Geometry" by Mark O. Martin & Gregory Benford, in VII, later novelized, is non-canonical.

The Houses Of The Kzinti merely collects "The Children's Hour, " "Briar Patch" (?) and "Cathouse."

The Best Of All Possible Wars merely collects "The Warriors" by Larry Niven, from Tales Of Known Space and The Man-Kzin Wars, "Madness Has Its Place" by Niven, from III, "The Man Who Would Be Kzin" by Greg Bear & SM Stirling, from IV, and "In the Hall of the Mountain King."