bit

Bit is an open-source build system for composing software from reusable components. It organizes source code into independent, composable components and lets teams assemble them into application shells, aiming to keep development consistent from local work through CI. Key capabilities described in the README: - Reusable components: create UI components and modules that can be shared across projects. - Standard building blocks: define blueprint templates for creating components, intended for both developers and AI agents. - Shell applications: compose reusable components and features into application shells. - Atomic and safe deployments: deploy apps and services for testing and production. The project states support for the JavaScript ecosystem, with official dev environments for NodeJS, React, Angular, Vue, React Native and NextJS, all native to TypeScript and ESM. It says Bit can fit monorepo, polyrepo, or repository-less structures. Getting started flow: install via `npx @teambit/bvm install`, initialize with `bit init --default-scope my-org.my-project`, create an app shell with `bit create react-app corporate-website`, run it with `bit run corporate-website`, and create components such as `bit create react pages/login`. Components can be composed into the shell via imports. Versioning uses semantic versioning (`bit tag`), and release uses `bit export`; builds can run locally with `--build` or through Ripple CI, and components can be consumed through standard package managers. Scopes can be hosted on Bit Cloud or self-hosted. The README also mentions MCP integration so AI agents can create and reuse components, and notes that Bit itself is built with Bit, with components published on Bit Cloud. Licensed under Apache 2.0.