Reactive GitHub Repositories (2026) · Open Source Tools

State machines, statecharts, and actors for complex logic

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

Build fast web applications with Rust.

Quarkus: Supersonic Subatomic Java.

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.

🎈 Simple reactive notebooks for Julia

Compose Multiplatform, a modern UI framework for Kotlin that makes building performant and beautiful user interfaces easy and enjoyable.

🏎️ Streams & Reactive Programming paradigm for Go: declarative and composable API for event-driven applications

A reactive notebook for Python — run reproducible experiments, query with SQL, execute as a script, deploy as an app, and version with git. Stored as pure Python. All in a modern, AI-native editor.

An Intuitive Event-Driven Reactive Programming Library for Java

Non-Blocking Reactive Foundation for the JVM

ReactiveX for Python

TCP/HTTP/UDP/QUIC client/server with Reactor over Netty

Build reactive applications with the Rails tooling you already know and love.

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

Reatom - the ultimate state manager

A Swift and Kotlin library for making composable state machines, and UIs driven by those state machines.

High performance reactive SQL client written in Java

The reactive JavaScript framework for single-page applications

A Cloud at the lowest level!