SignalDB is a local JavaScript database with a MongoDB-like interface and TypeScript support, enabling optimistic UI with signal-based reactivity across multiple frameworks. It integrates easily with libraries like Angular, Solid.js, Preact, and Vue, simplifying data management with schema-less design, in-memory storage, and fast queries.
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.