It's true that the FASA Corporation released two TNG Manuals, as well as Operation Armageddon, which would have had all-out war, larger scale campaigning to gaming, but there were other products in the works. Many of these were never completed, and a few never even got started when FASA lost it's License.
-TNG 2nd and 3rd Year Sourcebooks. Both would cover new races
from their season, various updated versions of the TNG
Characters, as well as new ones like Guinan and Dr. Leah Brahms,
Ship Statistics for the Borg, Enterprise-C and Romulan
Type A Scout Ship, and some star system/base data.
-ST:V Sourcebook, which has not been shown, as to how much of it
was completed, but it, like III and IV, would cover a timeline,
information on the politics of the star nations, as well as
Sybok, mythology of at least nine races, and Statistics for
Klaa and the Type I Shuttlecraft.
-Miniatures for the Galaxy-Class and Ferengi D'kora-Class Merauder,
the Galaxy-Class actually separating.
-Ed Whitefire's Deckplans for the Galaxy-Class, printed onto
RPG Cube-Spaces (which suggest little bulletlike Cargo Shuttles
with warp sleds, likely his doodling)
-Starfleet Diplomatics Manual, with more of a focus on TNG.
-Gorn, Orion and Ferengi Ship Recognition Manuals, as well
as a Ship Recognition Manual covering Yachts (Talk About Running Out Of Ideas)