Open-source alternatives to ReactiveCocoa

RxJava is a reactive stream processing framework and JVM reactive extensions library. It serves as an asynchronous dataflow orchestrator used to compose event-based programs by transforming, combining, and consuming real-time data flows on the Java Virtual Machine. The project distinguishes itself through integrated backpressure flow control, which manages the emission rate between producers and consumers to prevent memory exhaustion. It further provides mechanisms for concurrent thread management and parallel data processing to offload blocking operations and maintain application responsiven

GetX is a comprehensive state management framework for Flutter that provides a toolkit for managing application state, dependency injection, and routing without requiring build context. It serves as a core architectural system for reactive state management, navigation, service location, and multi-language theme support. The project is distinguished by its ability to handle context-free navigation and the use of observable variables that automatically trigger user interface updates. It features a dependency injection container with lazy loading and automated memory management, alongside a rout

The .NET Reactive Extensions Library is a framework for composing, querying, and transforming asynchronous data streams. It provides a non-blocking implementation of the observer pattern to manage notifications and data flows between producers and consumers, functioning as an event stream processing library. The project applies LINQ-style querying and filtering operators to asynchronous sequences. This allows for the handling of event-driven programming patterns by utilizing composable operators to process notifications as they occur. The library covers asynchronous data streaming and non-bl

Bond is a Swift data binding framework designed to synchronize data models and user interface elements through one-way and two-way value flows. It functions as a reactive suite for monitoring collection changes, transforming data streams, and bridging user interface events to data models. The project provides a reactive bridge that transforms user interface interactions and protocol delegate method calls into observable signals. It includes a collection observer to monitor changes in arrays and a functional data stream processor that applies operators to modify or combine values before they r

Voby is a signal-based framework for building reactive user interfaces. It utilizes fine-grained observables to track data dependencies and trigger direct updates to the document object model, bypassing the need for a virtual DOM reconciliation process. By wrapping state in proxies, the framework automatically intercepts mutations to ensure consistent data flow across the application. The framework distinguishes itself through a focus on performance and lifecycle precision. It employs reactive update batching to group state changes into single execution cycles, minimizing redundant operations

Dioxus is a cross-platform development framework designed for building native desktop, mobile, and web applications from a single codebase. It utilizes a declarative component model and macro-powered syntax to define reusable interface elements, which are then rendered as native widgets or web elements. At its core, the framework employs a signal-based reactivity system that tracks state dependencies to trigger granular updates, ensuring efficient interface performance without re-rendering the entire application tree. The framework distinguishes itself through a unified full-stack runtime tha

This project is a reference implementation of the Model-View-ViewModel pattern using Android Jetpack components. It serves as an architecture template and layering guide, dividing application code into view, domain, and data layers to ensure a unidirectional flow of dependencies. The implementation focuses on state management and configuration change handling. It demonstrates how to synchronize UI updates across multiple screens using shared state containers and preserves application state during transitions between portrait and landscape orientations. The codebase covers a broad surface of

Backbone is a JavaScript MVC framework and client-side data orchestrator used to structure web applications. It functions as an event-driven UI library and RESTful state manager that synchronizes data models with remote JSON interfaces to maintain consistent application state. The framework coordinates communication between application components through a decoupled event system. It binds data updates directly to the document object model, ensuring that the user interface remains synchronized with the underlying state. It provides tools for frontend data organization, allowing developers to

Mavericks is an opinionated Android state management framework that structures screen-level state as a single immutable object and processes user actions through a unidirectional data flow. It enforces state immutability to prevent unintended mutations and simplify debugging, while managing state subscriptions and cleanup based on Android lifecycle events to prevent memory leaks. The framework uses a ViewModel-driven architecture where business logic and state management are encapsulated in ViewModels that survive configuration changes. User actions are handled through dedicated intent object

Cycle.js is a functional reactive web framework and observable-driven UI library used for building web applications. It employs a reactive stream architecture that treats the document object model and side effects as continuous data streams, coordinating state and logic through a functional cycle. The framework distinguishes itself by isolating side effects from core logic using a system of drivers. This architecture maps external events to internal commands through a symmetric input-output pipeline, ensuring that the application remains a cycle of pure functions. The project provides capabi

Iced is a cross-platform GUI library for Rust designed for building native desktop applications. It functions as a reactive toolkit that manages application state by mapping user interactions to messages, which then trigger automatic view refreshes. The framework utilizes a rendering system that supports both hardware-accelerated GPU graphics and software backends to ensure compatibility across multiple operating systems. It implements a reactive model inspired by the Elm architecture to coordinate state updates and view reconciliation. The toolkit includes a flexible layout engine and a mod

Om is a frontend state management library and reactive user interface framework that integrates ClojureScript functional programming with the React virtual DOM rendering engine. It provides a bridge to build responsive web interfaces where visual elements automatically update when underlying application data changes. The project centers on a normalized state store that flattens complex data structures into a relational format. This data is accessed through a reader-based querying system, which decouples the user interface from the state by allowing components to declare specific data requirem

Floem is a native desktop UI framework and cross-platform toolkit for building high-performance user interfaces. It functions as a reactive UI library that uses a signal-based state management system to automatically synchronize the interface with data changes via lightweight observable primitives. The framework utilizes a GPU-accelerated rendering engine to ensure visual consistency and high performance across different desktop operating systems. It features a layout engine based on flexible box and grid models to create responsive screens that adapt to various window sizes. The toolkit cov

ReactiveUI is a .NET MVVM framework and functional reactive programming library designed to decouple application state from the user interface. It functions as a reactive state management tool that uses observable streams to handle mutable data and asynchronous event-driven logic. The framework provides a cross-platform UI toolkit that abstracts business logic from platform-specific views. This enables the creation of consistent user interfaces across multiple .NET platforms by utilizing platform-agnostic abstractions. The system focuses on application state management and decoupled UI testi

RxPY is a functional reactive programming library and a ReactiveX observable library for Python. It serves as an asynchronous stream processor and event-driven coordination framework used to build data pipelines that react to changes in state or streams of events over time. The library provides a toolkit for composing asynchronous and event-based programs using observable sequences and operators. It distinguishes itself through the use of configurable schedulers to manage concurrency, timing, and subscription lifecycles. The project covers a wide range of stream processing capabilities, incl

Reactor Core is a reactive programming toolkit and non-blocking foundation for composing asynchronous data pipelines on the JVM. It serves as an asynchronous stream processing framework and a backpressure management system, allowing developers to transform, filter, and combine sequences of events while regulating data flow between producers and consumers to prevent resource exhaustion. The library differentiates itself through a sophisticated concurrency scheduling system and demand-based flow control. It decouples signal processing from specific threads using a scheduler registry and provide

Knockout is a client-side UI library and JavaScript framework used to create responsive web interfaces. It functions as a declarative data binding library and an observable data model system that decouples business logic from the document object model. The project implements the Model-View-ViewModel pattern to separate application logic from the user interface. It synchronizes data models with visual views by linking internal JavaScript properties to HTML elements, allowing the interface to update automatically when underlying data changes. The framework provides capabilities for dynamic fro

Effector is a reactive state management library and data flow orchestrator designed for building complex, event-driven applications. It models application logic as a directed acyclic graph, where state updates and asynchronous side effects propagate automatically through declarative pipelines. By decoupling business logic from user interface layers, it allows developers to maintain state in independent containers that communicate via standard interfaces, ensuring the system remains framework-agnostic. The library distinguishes itself through its robust support for isolated execution scopes, w

R3 is a reactive extensions library and asynchronous data pipeline framework. It provides a system for composing asynchronous data streams, managing reactive state, and coordinating event sequences using observable patterns. The project distinguishes itself with a deterministic testing toolkit that mocks time and frame updates to ensure reproducible unit tests for asynchronous logic. It also includes observability tools for tracking active subscriptions and generating stack traces to identify memory leaks, alongside centralized exception routing for pipeline recovery. The framework covers a

Lit is a library for building lightweight, interoperable web components. It provides a base class that leverages native browser APIs to encapsulate state, logic, and styles, allowing developers to create custom elements that function consistently across any modern web project. The framework distinguishes itself through a reactive property system that automatically triggers efficient, batched DOM updates. By utilizing tagged template literals, it defines declarative UI structures that are compiled into optimized update instructions. Its architecture emphasizes modularity through a reactive con

RxJS is a library for reactive programming that provides a framework for composing asynchronous and event-based programs. It utilizes observable sequences to model data flows, allowing developers to manage complex sequences of events through a declarative programming interface. The library implements the observer pattern to facilitate decoupled communication between data producers and subscribers. By employing a lazy execution model, streams remain dormant until a consumer explicitly subscribes, at which point data production is triggered. This approach enables the construction of predictable

This project provides a formal specification and a set of standard Java interfaces for asynchronous stream processing. It defines a standardized protocol for passing sequences of elements between publishers and subscribers across different threads, centering on a reactive streams specification for the JVM. The project focuses on interoperability by providing a common API that allows different asynchronous streaming libraries to work together. This is achieved through a standard set of interfaces and bridging mechanisms that translate between incompatible streaming specifications. The specifi

MPX is a cross-platform framework designed to build applications for multiple mini-program ecosystems and the web from a single codebase. It utilizes a static transpilation pipeline to transform source code into platform-specific bundles, employing a single-file component system that encapsulates templates, logic, and styles. The framework provides a reactive state management system that automatically synchronizes application data with the user interface through computed properties and watchers. The project distinguishes itself through a robust build-time toolchain that supports sub-package p

Remax is a cross-platform UI framework and engine for building mini programs using React. It functions as a runtime that translates React components and hooks into native mini program elements, avoiding the need for static compilation. The framework provides a type-safe development environment to ensure reliability across cross-platform UI components. It allows for the creation of multi-platform mini programs from a single codebase by mapping React component trees to native structures during execution. The system covers cross-platform mini program development, including UI construction with

web3-react is a React framework for building decentralized applications that connect to Ethereum wallets and read blockchain state. It provides a unified interface for wallet connection management, enabling Ethereum dApp development through a collection of hooks and providers that abstract away provider-specific logic. The library is built around a connector plugin architecture that normalizes interactions across different Ethereum networks and wallet implementations. It distributes blockchain state through React Context and synchronizes state reactively by subscribing to provider events like

The Reactive Extensions for JavaScript

The Rust Programming Language Book is the official technical guide and educational resource for the Rust language. It provides a comprehensive walkthrough of the language's design, focusing on its core identity as a systems programming language that enforces memory safety and high-performance execution without the need for a garbage collector. The project is distinguished by its focus on ownership, borrowing, and lifetime tracking, which allow the compiler to verify memory safety and thread safety at compile time. It covers the language's unique approach to zero-cost abstractions, including t