Open source. Open possibilities.

Flutter is Google's open-source SDK for building fast, beautiful apps for mobile, web, and desktop from a single codebase, featuring hot reload, rich widgets, and native performance.

Flask is a lightweight WSGI web application framework for Python, designed for quick starts and scalable complexity. Built on Werkzeug and Jinja, it lets developers choose their own tools and libraries, with a wide ecosystem of community extensions.

Yew is a Rust/Wasm framework for building multi-threaded front-end web apps. It uses a JSX-like macro for HTML in Rust, minimizes DOM calls, supports web workers, and interoperates with JavaScript and NPM packages.

Iris is a full-featured HTTP/2 web framework for Go, offering typed routing, built-in middleware, MVC, WebSockets, gRPC, sessions, caching, i18n and rich request/response handling. The README also previews a generics-based v14 that has no release date yet.

Block is a local-first polyglot orchestration engine for writing multi-language workflows—Python, JavaScript, Lua, PHP, SQL, PowerShell—in single .blk files. It coordinates host runtimes, passes serializable shared state between blocks, and runs on Windows via CLI. Editions: Lite, Standard, Plus.

Runique is a type-safe Rust web framework inspired by Django, providing declarative models, migrations, forms, routing, and an admin panel built on Axum, SeaORM, and Tera.

SpacetimeDB is a relational database that also acts as an application server, letting developers upload server-side logic as modules and have clients connect directly for real-time state synchronization.

AdonisJs is a fullstack MVC framework for Node.js designed for building web applications and microservices with a focus on ergonomics and speed.

Echo is a high-performance, extensible and minimalist Go web framework built on Go's standard net/http, offering a radix-tree router, request binding, grouping, a middleware ecosystem, centralized error handling, HTTP/2 and automatic TLS.

Rocket is an async web framework for Rust focused on usability, security, extensibility, and speed, with type-safe routing and extensive documentation.

Vapor is an HTTP web framework for Swift, providing an expressive foundation for building websites, APIs and cloud projects. It targets Swift 6.0+, ships under the MIT license, and is backed by an active Discord community plus documented guides.

Sanic is a Python 3.10+ async web server and framework designed for fast HTTP performance, supporting ASGI deployment and async/await syntax.

Volga is a fast, simple, high‑performance Rust web framework built on Tokio and Hyper, offering explicit APIs, predictable performance, HTTP/1‑2, middleware, DI, WebSockets, and OAuth 2.1 support.

Expo is an open-source framework for building universal native apps with React that run on Android, iOS, and the web. The repository bundles the Expo SDK, Modules API, CLI, Router, Go client, templates, and documentation.

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript. The repository provides the framework source, documentation links, development setup via Angular CLI, ecosystem info, and contributing guidelines.

An animation-first React framework designed for high-fidelity visual websites, featuring persistent shells and live-tweakable motion tokens.