boardgameio/boardgame.io: State Management and Multiplayer Networking for Turn-Based Games

boardgame.io is a JavaScript engine for developing turn-based games. It handles state management, multiplayer synchronization, and AI bots automatically, making it easy to create and manage game state without writing networking or storage code. Features include game phases, a lobby for matchmaking, prototyping tools, and extendable plugins. It supports vanilla JS and React/React Native. The community offers documentation, examples, and support for contributors.