Declarative GitHub Repositories (2026) · Open Source Tools

The library for web and native user interfaces.

A declarative, efficient, and flexible JavaScript library for building user interfaces.

Declarative dynamic forms engine. Define dynamic forms with a typed TypeScript builder or as JSON, then render them in React, Angular, Vue, Lit, or vanilla JS. Includes validation, SSR, i18n, accessibility, theming, and an MCP server for AI assistants.

Open Policy Agent (OPA) is an open source, general-purpose policy engine.

🐤 The friendly full-stack language

Web Components for building declarative, graphical web apps

Declarative AI pipelines in one YAML file. Tokens, audio chunks, and video frames flow between isolated components. Compose 100+ components for models, agents, speech, vision, and live broadcast. Run local models, cloud APIs, or both. Inspired by docker-compose.

Reactive HTML attributes. No build step, signals-based, CSP-safe.

decK: Configuration management and drift detection for Kong

Declarative UI construction for iOS, written in Swift

Open Control Plane for Tables in Data Lakehouse

Declarative pure-SQL schema management for MySQL and MariaDB

A thin layer on top of docker compose for declarative configurations

a declarative UI library for C/C++

Harness as code — the Terraform for AI agents. Define your agent team AND its memory once, deploy to Claude Code, OpenClaw, Cursor, Codex, Gemini, Copilot, Kiro. Declarative .at language + agent-maintained, Obsidian-portable company brains + interactive visualizer.

Declarative binary reading and writing: bit-level, symmetric, serialization/deserialization