Here's a list of things I've read, things I've heard about and want to read and things I'm interested in but they are just a guess.
Stuff I read:
James Luceno and Brian Daley, using the pen name Jack McKinney wrote a series of novelizations of the series Robotech. There were a total of 21 books, a dozen covering the series and then some continuations. The come and go out of print.
Looks like they are coming back in print over the next year. I really enjoyed them.
Yoshiuki Tomino wrote a trilogy novelization of the original Mobile Suit Gundam series. Because of Del Rey's success with the Robotech books, they translated them. He also wrote novelizations of the sequel series Zeta Gundam, but those haven't been translated, so far as I know.
I read a novella called Messenger by Yudhanjaya Wijeratne & R.R. Virdi. It was nominated for some awards and was freely available. It doesn't seem to be for sale anymore as the collection it was in is OOP. But you can likely find it online. It was free and may still be.
Stuff I've heard good things about, but haven't read:
Michael Stackpole has written a number of Battletech novels. But he wrote a trilogy that are generally considered to be the best Battletech books:
En Garde
Riposte
Coupé
Stuff I discovered by poking around Amazon, but haven't read:
The Messenger by J.N. Chaney. This is a long series, fifteen books so far. I believe the first thirteen tell a story and book fourteen starts a second one.
The first book is $1.
An author with the unlikely name of Jake Bible has written
Fighting Iron, which has since been renamed
A Fistful of Mechs.
Lastly, Mark Wandrey has a series called The Revelation Cycle. I picked up the first one,
Cartwright's Cavaliers.