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WebTorrent provides one JavaScript BitTorrent client for browsers and Node.js. It exposes files as streams, so applications can play or seek before a download finishes, and it can also seed files. Browser clients use WebRTC without plugins and can connect only to WebTorrent/WebRTC-compatible peers, while the Node.js client communicates with conventional peers over TCP and UDP.

lowdb is a lightweight local database for JavaScript and TypeScript. Node.js applications can persist data in JSON files, while browser projects can use LocalStorage or SessionStorage presets; queries and updates use ordinary objects and array methods. It includes type declarations, safe atomic writes, and replaceable adapters for other formats or encryption. It is intended for simple local persistence rather than a network database.

simple-peer wraps WebRTC in a concise Node.js-style API that runs in browsers and Node.js. It supports video and voice streams plus text or binary data channels, with a Node duplex-stream interface for server-side use. Advanced options cover trickle ICE, custom configuration, transceivers, and renegotiation, making it a small communication layer rather than a complete calling service.

electron-store is a JSON-file persistence module for Electron applications, intended for user settings, application state, and small caches. It supports dot-notation access, defaults, JSON Schema validation, migrations, and atomic writes, and can be configured for the main or renderer process as documented. It is not a database because every change reads and writes the whole file. The current package requires Electron 30 or later and provides native ESM only.