What other good books are there like Gate?

"Gate" is a broad term. Do you mean "Gate: Jieitai Kanochi nite, Kaku Tatakaeri" (the light novel)? Or "Gate: Thus the JSDF Fought There!" (the anime)? Or are you thinking of something else entirely?

To give you the best recommendations, please tell me:

* What aspects of Gate do you enjoy? Is it the military action, the fantasy world, the exploration of a new culture, the character development, or something else?

* What other genres do you like? Are you looking for more fantasy, sci-fi, military, or something else?

* What kind of reading experience are you hoping for? Are you looking for a light and fun read, something more serious, or a thought-provoking story?

Once I have a better understanding of your preferences, I can suggest some excellent books that you might enjoy.