Babylon 5

The Babylon 5 range of novels are interesting, with an initial run starting in the mid 1990s that, although licensed, were largely non-canon and not endorsed by showrunner, J. Michael Straczynski (JMS). Only Books 7 & 9 of the run are considered canon and both were reprinted in the early 2000s.

Voices written by John Vornholt (1995)
Accusations written by Lois Tilton (1995)
Blood Oath written by John Vornholt (1995)
Clark’s Law written by Jim Mortimore (1996)
The Touch of Your Shadow, the Whisper of Your Name written by Neal Barrett, Jr. (1996)
Betrayals written by S. M. Stirling (1996)
The Shadow Within written by Jeanne Cavelos (1997; 2002)
Personal Agendas written by Al Sarrantonio (1997)
To Dream in the City of Sorrows written by Kathryn M. Drennan (1997; 2003)

Later the range moved into releasing trilogies of novels. All of these are considered canon.

The Psi Corps Trilogy by J. Gregory Keyes

Dark Genesis – The Birth of the Psi Corps (1998)
Deadly Relations – Bester Ascendant (1999)
Final Reckoning – The Fate of Bester (1999)

Legions of Fire by Peter David

The Long Night of Centauri Prime (1999)
Armies of Light and Dark (2000)
Out of the Darkness (2000)

The Passing of the Techno-Mages by Jeanne Cavelos

Casting Shadows (2001)
Summoning Light (2001)
Invoking Darkness (2001)