Hexagonal Chess
This package is a web component implementation of HexChess.
It is designed to be a completely standalone implementation with a fully functioning game engine, so two players can play on a single machine together in person.
Alternatively, it can also be used to analyze games and be fed a pre-determined set of moves.
The component will disallow illegal moves and detect game over states, along with more complex cases such as en passant, preventing moving pinned pieces, and promotions.
See the full documentation here.