Open-source alternatives to Valdi

Xray is a collaborative text editor and distributed workspace manager that utilizes conflict-free replicated data types to synchronize real-time edits and directory structures across peers. It functions as both an Electron-based desktop application and a headless editor server that manages workspaces and file systems remotely for connected clients. The project distinguishes itself by integrating fine-grained version control tracking, recording keystroke-level changes and uncommitted edits between Git commits. It employs a decentralized synchronization model for working copies and uses operati

LuaViewSDK is a cross-platform UI engine and framework that uses a Lua-based scripting engine to render native user interfaces across multiple mobile operating systems. It functions as a dynamic UI orchestrator, separating interface logic from the underlying operating system to allow for the creation of native views driven by scripts. The system features a bidirectional native scripting bridge for exchanging data and triggering functions between the script runtime and native platform APIs. It also includes a Lua game runtime capable of executing interactive graphics and lightweight games thro

AsyncDisplayKit is an asynchronous UI framework and performance library for iOS. It provides a collection of performant alternatives to standard views, allowing developers to build responsive interfaces by offloading layout and rendering tasks to background threads. The framework is centered around a declarative layout engine based on a flexbox model, which calculates element positions and sizes asynchronously. It utilizes a node-based abstraction to wrap native views, enabling the instantiation and configuration of UI hierarchies on background threads to prevent main thread blocking. The sy

NativeBase is a comprehensive toolkit of accessible components and responsive design frameworks used to build consistent mobile and web applications. It provides a cross-platform UI component library and a React Native component framework that enable the creation of layouts across Android, iOS, and the web from a single codebase. The system is distinguished by a responsive design system that automatically adjusts layouts and global themes to fit different screen sizes and color modes. It utilizes a utility-based styling approach, allowing developers to apply visual styles directly through com

react-native-godot is a communication layer and embedding system that integrates the Godot game engine into cross-platform mobile applications. It allows Godot game scenes and logic to be rendered as interactive visual components within a mobile user interface. The project provides a threaded logic bridge that executes engine functions on dedicated background threads using worklets. This ensures that game engine operations do not block the main application user interface. The system covers engine lifecycle management, including the ability to start, stop, and pause instances to load differen

nw.js is a Node.js desktop application framework that combines a Chromium web renderer with a Node.js runtime to build standalone software for Windows, macOS, and Linux. It serves as a cross-platform desktop runtime that allows developers to create native executables using web technologies. The project is distinguished by its integration layer that exposes Node.js system APIs and modules directly to the browser window and web worker contexts. It functions as a native module bridge, enabling the compilation and execution of low-level C++ system code and native addons within a web-based applica

ComponentKit is a declarative UI framework for building iOS interfaces through composition of small, reusable components. It provides a structured approach to constructing user interfaces where each component is defined as an immutable, pure function of its inputs, enabling predictable rendering and state management. The framework supports both stateless and stateful components, with controllers that can be attached to manage persistent state across component updates. The framework distinguishes itself through its component architecture that emphasizes explicit data flow and compile-time safe

This project is a collection of reference implementations and code samples for building cross-platform user interfaces using the Xamarin.Forms framework. It provides practical examples for developing mobile and desktop applications from a single codebase targeting multiple operating systems. The repository focuses on architectural patterns and integration strategies, specifically demonstrating the use of MVVM to synchronize data between models and views. It includes samples for native platform integration, such as invoking platform-specific APIs and creating custom renderers to override defau

This project is a cross-platform mobile app template and UI starter for Android and iOS. It provides a foundation for building consistent mobile interfaces from a single declarative codebase. The architecture implements a reactive state management framework using BLoC and RxDart to decouple business logic from the user interface. It also includes an internationalized mobile architecture to manage multi-language support and regional localization across the application. The codebase covers capabilities for mobile client implementation, including the rendering of remote content, local data pers

WinObjC is an implementation of the Objective-C language runtime and object model for the Windows operating system. Its primary purpose is to enable the execution of Objective-C code and iOS APIs on Windows to support the porting of iOS applications. The project features a native API bridge that maps Objective-C system framework calls to native Windows API functions. It includes a toolchain to convert Xcode project targets and workspaces into Visual Studio formats and translates visual storyboard design files into active on-screen interface elements. The codebase covers binary interoperabili

Play is a full-stack reactive web framework for Java and Scala. It provides a comprehensive development platform for building scalable web applications and RESTful APIs using a stateless and non-blocking architecture designed for high concurrency. The framework emphasizes high-velocity development through dynamic code reloading, which allows developers to update applications and verify changes without performing a full restart. Its capability surface covers the construction of JSON-based web endpoints, server-side logic for the JVM, and the implementation of scalable web architectures.

The Dart SDK is a comprehensive development kit for building cross-platform applications using a multi-paradigm programming language. It provides a unified toolchain that supports both just-in-time compilation for rapid development and ahead-of-time compilation for high-performance native machine code. The platform is built on a sound static type system and an isolate-based concurrency framework, which executes independent tasks in separate memory heaps to achieve parallelism without shared state contention. The SDK distinguishes itself through a versatile compilation pipeline that transforms

This project is a web component tooling system used to compile TypeScript and JSX into standard-compliant custom elements. It enables the development of framework-agnostic components that function across different browsers and frontend environments. The toolset focuses on cross-framework UI distribution, allowing a single library of components to be used in React, Angular, Vue, or plain HTML. It includes capabilities for enterprise design system engineering and generates specific wrapper code to ensure components behave as native elements within various frameworks. The system covers server-s

This project is a Flutter e-commerce UI kit and cross-platform mobile template providing a comprehensive library of screens and layouts for digital storefronts. It is designed to work across both Android and iOS operating systems to facilitate the development of online shopping applications. The kit includes pre-designed interfaces for product discovery, featuring homepages, category catalogs, and search filters. It also provides a dedicated series of layouts for mobile authentication, including user registration, login, and password recovery processes. The codebase covers a wide range of co

Bud is a full-stack web framework for Go that functions as a scaffolding engine and code generation tool. It automates the creation of directory structures, controllers, and glue code to streamline the development of web applications. The framework utilizes a transpiler-based approach to produce application boilerplate and provides a development environment featuring hot reloading and local server management. It enables the compilation of applications into single, standalone binaries with support for cross-platform compilation across different operating systems and architectures. The system

PakePlus is a web-to-native converter and application packager that transforms website URLs or static directories into standalone native desktop and mobile applications. It provides a native browser shell to wrap web content, acting as a cross-platform application shell for Android, iOS, and various desktop environments. The project distinguishes itself through a cloud-based app packager, utilizing remote build pipelines to compile application binaries without requiring a local development environment. It includes a JavaScript injection tool and a system-level API bridge, allowing users to ad

Blitz is an HTML and CSS rendering engine and native UI framework designed to translate web-standard markup into visual interfaces for native applications. It functions as a layout engine that converts raw HTML strings into a structured object model for programmatic rendering. The project implements a web-standard layout engine using Flexbox and Grid models to compute element positions and sizes. It includes a dedicated SVG graphics renderer for displaying scalable vector graphics embedded within HTML-based layouts. The framework covers native windowing integration and system accessibility t

This framework is a cross-platform software development kit designed for building native mobile and desktop applications from a single shared codebase. It provides a unified programming interface that allows developers to construct user interfaces using declarative markup, which are then rendered as native components on each target operating system. The framework distinguishes itself through a multi-targeting build system that consolidates platform-specific resources and native control mapping into a unified project structure. It includes a data-driven binding engine that synchronizes applica

MvvmCross is a .NET MVVM framework designed for building cross-platform applications by separating business logic from native user interfaces. It functions as a navigation engine and a UI data binding library, enabling the encapsulation of logic within view models that are reused across different operating systems. The framework provides a native hardware abstraction layer and a dependency injection container to decouple components and provide a consistent interface for accessing device features. It coordinates type-safe transitions between native screens and manages the synchronization of da

NativeScript is a cross-platform mobile development framework that enables the creation of native iOS and Android applications using JavaScript or TypeScript. It provides a direct bridge to native platform APIs, allowing developers to invoke native classes, methods, and properties directly from script code while maintaining full access to underlying mobile operating system features. The framework distinguishes itself through its direct native UI rendering, which maps declarative markup components to actual platform-native widgets rather than web-based views. This architecture is supported by

Apollo Universal Starter Kit is a full-stack application boilerplate and starter template designed to accelerate cross-platform development across web, mobile, and server environments. It provides a modular architecture that organizes code into independent, self-contained feature directories, combined with a GraphQL-driven data layer and a server-side rendering pipeline to optimize performance and search engine optimization. The project incorporates compile-time code generation tooling to automatically scaffold schemas, resolvers, and components, alongside a real-time subscription engine for

This project is a UI library for building customizable calendar views across Android and Kotlin Multiplatform projects. It provides a recycler-based architecture for creating month, week, and year calendars, alongside a set of composable functions for rendering interactive date pickers and month views in Jetpack Compose. The library includes a contribution heat map component for displaying data density over time using color-coded day cells. It also provides a toolkit for implementing date range selection interfaces that support single date, multiple date, or date range selection with boundary

KMP-Awesome is a curated directory and resource index for the Kotlin Multiplatform ecosystem. It serves as a centralized hub for developers to discover libraries, frameworks, and tools designed to streamline the creation of shared codebases for mobile, desktop, and web applications. The project distinguishes itself by organizing a comprehensive collection of solutions that address the core challenges of cross-platform development. It highlights resources for implementing shared business logic, declarative user interface components, and type-safe data persistence layers. By providing a structu

Flutter-html is a markup rendering engine and UI component library that parses static HTML strings and CSS styles into native user interface widgets for cross-platform mobile and desktop applications. Its core architecture manages media controllers, style cascade engines, markup-to-widget translation, and native platform view embedding through modular extension packages. The library supports content styling using cascading style sheet rules, custom element rendering, data tables, mathematical equation rendering, vector graphics, and embedded frames or web browser components. It includes mult

This project is a collection of reference implementations and sample applications for Flutter. It provides practical examples covering API integration, user authentication, data persistence, and a gallery of UI patterns. The repository distinguishes itself by offering a wide array of functional demos, including implementations for Google and email-based identity verification, cloud database synchronization, and the use of both relational and key-value local storage. It also includes specialized utility examples such as expense tracking, tip calculation, and body mass index tools. The project

MoviePilot is a self-hosted media orchestrator and NAS media library automator. It coordinates workflows between downloaders, metadata scrapers, and file systems to automate the discovery, downloading, renaming, and organization of movie and television content. The system functions as an LLM media management agent, allowing users to control subscriptions, searches, and file organization through conversational text commands. It also acts as a Model Context Protocol server, exposing internal media management tools via a standardized interface for external AI clients and agents. The project inc

Vditor is a browser-based Markdown editor and rendering engine that supports multiple editing interfaces, including a visual rich-text experience, instant rendering, and a traditional side-by-side split-view preview. It serves as an authoring tool for technical documentation and a component for web-based editor integration. The project is distinguished by its support for complex technical content, utilizing specialized rendering for mathematical formulas, flowcharts, sequence diagrams, and mind maps. It also functions as a collaborative document review tool, enabling users to attach anchored