There are many mods that use NEO-STANDARD ships. Adamant through the Star Trek mod have callings for them. But the best way to get them all is to simply make your own mod. That is were a lot of the underlining fun lays for Space Empires IV.
BTW,
NASY has many neo-standard compliant ship sets, including all of the star trek sets, say for the Tholians. (The new Federations sets are not yet posted, but will be soon.)