LEESt is a large plugin (~7000 lines as of v0.10.6), meaning that it brings a lot of content into the game. Here are some of the major things.
This document is unfinished. Because there's simply so much stuff within LEESt.
The Sayari Plushie Authority is a large organization active in the Illumina Regions. Their main responsibility is to sell plushies of Sayari and Freya Winters (that ambassador you meet in the Wanderer campaign and that one Free Worlds councillor respectively).
The Amidala-class Battleship is the SPA's variant of the Kor Mereti's Kar Ik Vot 349.