Open-source alternatives to Flutter Html

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

Nextplayer is a cross-platform mobile media player designed for playing audio and video from local storage and remote URLs. It functions as a playback engine that supports various codecs and containers through software-based media decoding. The application features a floating picture-in-picture window for multitasking and an external subtitle renderer that synchronizes and displays SRT, SSA, and VTT files as on-screen overlays. It includes a touch-based interface that maps specific swipe and pinch gestures to volume, brightness, and seeking controls. The project covers multi-source media str

gpui-component is a native desktop UI kit and component library built for the GPUI framework. It provides a collection of reusable user interface elements, a desktop layout engine for organizing application space, and a specialized data visualization library for rendering quantitative information. The project is distinguished by its high-performance rendering systems, including a virtualized data grid and list system designed to handle large datasets with low memory overhead. It also features a comprehensive data visualization toolkit for rendering charts, axes, and coordinate scales using li

This project is an HTML-to-native renderer and cross-platform UI component that transforms web-standard markup into native mobile components. It functions as a CSS-to-native style engine and a customizable HTML parser, allowing web content to be displayed in mobile applications without the use of a full web view. The library is distinguished by its ability to intercept and modify the HTML DOM tree before rendering, enabling the injection of custom components, the filtering of specific nodes, and the overriding of default element translation models. It also implements a sophisticated style res

This project is a cross-platform UI framework and native desktop GUI library. It provides a unified set of instructions to render native windows, forms, and layouts across different operating systems by mapping high-level instructions to the native widgets and controls of the host environment. The toolkit includes a vector graphics engine for rendering custom shapes, gradients, and high-density images using brushes and matrices. It also serves as a native dialog provider for system-level operations such as file path selection and message box alerts. The library covers a broad range of GUI co

Gollum is a Git-powered wiki engine and content management system that provides a web-based interface for editing and organizing files stored in a Git repository. It functions as a self-hosted documentation tool, using a Git-based storage backend to manage page content and track version history. The system is characterized by a pluggable markup rendering architecture that converts multiple markup languages and specialized notations into HTML. It supports a wide array of rich content, including mathematical typesetting, BibTeX bibliographies, and diagrams rendered via Mermaid. Broad capabilit

android-iconify is a multi-provider icon framework and library for Android applications. It enables the integration and management of vector graphics and font icons from various external providers within a single system. The framework allows for custom icon font integration by registering font files and character maps to expand the available library of graphics. It includes a vector graphic drawable renderer to display scalable icons across different screen densities. The system supports rendering vector icons as drawable objects and embedding scalable graphics directly into text spans so th

This is a plugin for embedding inline or headless web browsers within Flutter applications to render web content. It provides a system for integrating native webview components directly into the widget tree, allowing for the display of web pages and local assets. The project distinguishes itself by offering a headless browser controller for programmatic interaction and data extraction, as well as tools to wrap Progressive Web Apps into native application containers. It includes a mobile bridge for WebRTC to manage camera and microphone permissions for real-time audio and video communication.

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

This project is a general purpose library for the .NET ecosystem, providing a collection of reusable helper methods and APIs for common programming tasks. It encompasses a UI component library for cross-platform development, a toolkit for MVVM architecture, and specialized utilities for memory management and native interoperability. The library distinguishes itself through high-performance memory abstractions, such as pooled buffers and contiguous two-dimensional memory spans, designed to reduce garbage collection pressure. It also provides native interop wrappers and bindings to facilitate d

Indigo Player is a JavaScript media framework designed for building custom web-based video playback experiences. It functions as a modular HTML5 video player that supports adaptive bitrate streaming for formats including HLS, MPEG-DASH, and MP4. The framework provides a consistent interface for rendering video content while managing stream quality, subtitle tracks, and thumbnail previews. The player distinguishes itself through a plugin-based architecture that allows developers to extend core functionality without modifying primary logic. This modular design supports dynamic module loading, w

Simpl is an HTML, CSS, and JavaScript example library that provides a collection of minimal functional demonstrations of core web technologies and native browser APIs. It serves as a reference implementation and pattern gallery for frontend development, offering practical examples of how to implement common web features. The project showcases a wide range of browser capabilities, including real-time web communication via WebSockets and WebRTC, responsive web design techniques for adaptive layouts, and the implementation of offline workflows using service workers. It also provides demonstratio

Seedbox-lite is a self-hosted media center and torrent streaming gateway. It functions as a containerized application that orchestrates a torrent engine and a responsive web interface to manage downloads and stream video content. The system separates the torrent backend from the frontend via a REST API. It enables real-time playback of video files from torrents, allowing viewing to begin before the full transfer completes. The platform covers torrent download management using magnet links, media playback with subtitle integration, and disk cache management. Access is secured through password

gluestack-ui is a cross-platform React component library built with Tailwind CSS. It provides over 30 pre-built, accessible components that can be installed by copying their source files directly into a project, giving developers full control over customization without external runtime dependencies. Every component implements WAI-ARIA patterns, keyboard navigation, and screen reader support out of the box. A key differentiator is the copy-paste architecture: rather than a traditional package dependency, component source code is placed in the project, allowing direct editing and eliminating ve

This project is a comprehensive collection of web development reference guides and technical cheat sheets. It provides a curated set of markdown-based documentation designed to help developers quickly locate syntax patterns and API examples for common web technologies and programming languages. The repository serves as a specialized reference library covering several distinct technical domains. It includes extensive guides for CSS, focusing on selectors, Flexbox, Grid, and responsive layout properties, as well as a DevOps command reference for Docker, Kubernetes, AWS, Ansible, and general she

This is a native library for embedding and controlling YouTube video playback within Android applications. It functions as a playback controller that synchronizes video states with the hosting activity or fragment lifecycle. The library includes a framework for replacing default playback controls with custom layouts and interfaces. It also provides a sender extension for streaming YouTube video content from an Android device to Chromecast receivers. The project covers programmatic playback control, background audio playback, and player state monitoring. It also handles network connectivity a

react-native-video is a cross-platform video player component for React Native that enables the playback of local and remote video files using native platform decoders. It functions as an adaptive streaming player supporting HLS, DASH, and SmoothStreaming formats with automatic bitrate selection and quality adaptation. The project is distinguished by its support for industry-standard digital rights management, including Widevine, FairPlay, and PlayReady, and a plugin-based architecture that allows for the injection of custom analytics or playback logic without modifying the core library. It a

Valdi is a cross-platform native UI framework that compiles declarative TypeScript code into native platform views. It functions as a declarative UI engine and multi-platform frontend toolchain designed to achieve high performance by avoiding web views. The framework features a native bridge binding tool that generates type-safe bindings between TypeScript and native languages, allowing direct access to platform APIs. It supports a hot-reload development workflow, enabling real-time updates to the user interface across platforms without requiring full project recompilation. The system includ

DKVideoPlayer is an Android video player library and media playback framework designed to integrate advanced streaming and playback capabilities into mobile applications. It provides a hardware-accelerated video renderer and a customizable UI kit for building player interfaces, including support for picture-in-picture floating windows. The framework distinguishes itself through specialized interactive features, such as real-time comment overlays, frame capture snapshots, and gesture-based controls for adjusting volume, brightness, and playback progress. It also supports multi-stream playback,

Atomic Layout is a declarative framework for building responsive user interfaces in React. It functions as a layout engine that abstracts complex grid structures into reusable components, allowing for the creation of hierarchical spatial distributions without the need for manual media queries. The library distinguishes itself by mapping visual layout regions to component structures through dynamic grid-template-area generation. It utilizes a property-based system where components accept specific suffixes to automatically trigger responsive style adjustments based on viewport width. By employi

BannerViewPager is a customizable Android UI component for creating sliding banners and image carousels. Built upon ViewPager2, it provides a system for rendering sequences of content with integrated automatic playback and infinite looping. The library distinguishes itself through transformer-based page transitions that allow for scaling or overlapping effects. It features a pluggable indicator system and support for multi-layout rendering, enabling different visual structures for individual items based on their data type. Broad capabilities include playback control synced with the Android v

Packery is a JavaScript bin-packing grid layout engine and DOM element positioning library. It arranges elements of varying sizes into a gapless, compact grid by calculating and applying absolute coordinates to HTML elements to prevent overlapping. The library enables the creation of draggable grid interfaces, allowing users to rearrange elements via drag-and-drop while the system automatically reflows the remaining items. It maintains stable, responsive layouts across different screen dimensions by using a percentage-based positioning system and responding to window resize events. The tool

handcalcs is a mathematical documentation generator and Python LaTeX calculation renderer. It serves as an automated calculation sheet tool that converts Python code and numeric calculations into formatted LaTeX mathematical documentation, functioning as both a symbolic math formatter and a Jupyter notebook math extension. The project transforms Python variable names into Greek symbols, subscripts, and standard mathematical notation. It converts code into formatted mathematical expressions that display the original formula, the numeric substitution, and the final result, allowing for the crea

al-folio is a Jekyll academic theme and portfolio generator designed for researchers and professors to build professional homepages, lab sites, and research profiles. It functions as a system for creating a digital academic identity, combining a website template with tools for scientific and academic publishing. The project distinguishes itself through specialized scholarly workflows, such as automated publication lists and bibliography management driven by BibTeX files. It provides specific layouts for digital academic CVs, research portfolios, and the rendering of mathematical expressions a

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

Webstudio is a visual CMS and website builder that provides a visual development environment for designing and publishing websites. It functions as an AI-powered design tool, a REST and GraphQL API client, and an atomic CSS compiler. The platform distinguishes itself through generative AI capabilities for creating layout variants and refining visual styles from text prompts. It integrates a headless CMS workflow that maps external data sources to visual components and utilizes a specialized compiler to convert design tokens into deduplicated atomic CSS for optimized page load speeds. The sys

Hilo is an HTML5 game engine for building 2D games that run across browsers and devices. It renders graphics through Canvas, DOM, or WebGL backends, automatically selecting the best option for the target environment. The engine provides a complete game development solution with sprite, skeletal, and particle animation, along with a texture atlas system for efficient image loading and rendering. The framework distinguishes itself through its integration of the DragonBones skeletal animation engine, which drives bone-based character movement without frame-by-frame sprites, and its Chipmunk phys