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Packages 
Package Description
io.vavr
Beside API the io.vavr package contains core types like (Checked)Functions and Tuples.
io.vavr.collection
Purely functional collections based on Traversable.
io.vavr.concurrent
This package contains basic building blocks for creating fast, asynchronous, non-blocking parallel code.
io.vavr.control
Control structures like the disjoint union type Either, the optional value type Option and Try for exception handling.
io.vavr.match  
io.vavr.match.annotation  
io.vavr.match.generator  
io.vavr.match.model  
io.vavr.test
A property check framework built around Property which integrates well with unit test frameworks like junit.