Open Source Android User Interface (UI) Apps

Kivy is an open source, cross-platform UI framework that lets you develop applications that make use of innovative, multi-touch user interfaces. Written in Python with a graphics engine built over OpenGL ES 2, Kivy supports various input devices and protocols, and gives you access to over 20 widgets that are all highly extensible and have built-in multi-touch support. You can run the same codebase on Mac, Windows, Linux, Android and iOS. Kivy is 100% free and open source with a professionally developed and used toolkit, as well as a stable framework and well-documented API, so you can be confident in using it in a commercial product.

Litho uses a declarative API to define UI components. You simply describe the layout for your UI based on a set of immutable inputs and the framework takes care of the rest. With code generation, Litho can perform optimisations for your UI under the hood, while keeping your code simple and easy to maintain. Litho can measure and layout your UI ahead of time without blocking the UI thread. By decoupling its layout system from the traditional Android View system, Litho can drop the UI thread constraint imposed by Android. Litho uses Yoga for layout and automatically reduces the number of ViewGroups that your UI contains. This, in addition to Litho's text optimizations, allows for much smaller view hierarchies and improves both memory and scroll performance.

WeUI is a UI framework that was officially designed by the WeChat design team and tailor-made for WeChat web development. It contains a set of basic style libraries that are consistent with WeChat’s standard visual experience. WeUI was made to ensure that WeChat users could have the same clean, uniform experience with all WeChat web services, and to make their perception of WeChat applets more unified and cohesive. WeUI covers everything from form factors (buttons, lists, sliders, etc.) and basic components (articles, badges, footers, galleries, etc.), through to search, navigation and leveling of page elements.

Avalonia is a cross-platform UI framework for dotnet, providing a flexible styling system and supporting a wide range of Operating Systems such as Windows, Linux, macOS. Avalonia is mature and production-ready. We also have in beta release support for iOS, Android and in early stages support for browsers via WASM. Avalonia is open source, free to use, and always will be. Clone the source today to dig deeper. The free VS extension provides everything needed to start, including a XAML previewer. JetBrains deep understanding of Avalonia shines through with rich Rider and R# support. Deploy to the platforms you care about with ease. Leverage existing knowledge, code and packages to kickstart your project. Get the support your project needs with one of our commercial support agreements. Help you can count on. JetBrains delivers huge productivity gains for Avalonia developers.

Weex is a framework for building performant mobile apps with modern web technology. Weex is using native components and native modules to take advantage of native rendering performance and platform capabilities. Both components and modules are pluggable and extendable. You can use a single codebase to generate different bundle files to running on both Webs, Android and iOS platforms. Native components and modules have a different implementation on each platform, but they all exposed the same API. Weex embraces the existing Web ecosystem, you can use modern front-end technology to develop your mobile apps. Weex supports most commonly used CSS properties and most popular front-end frameworks, such as Vue and Rax, maybe more in the future. Weex has been large-scale used in many super apps for a long time, served almost billions of people in total. Weex also derived many engineering products and platforms for industry development.

CSS-Vise A lightweight, minimal and mature vanilla CSS framework built with care. It can be used as a primary framework or as a secondary one alongside any other framework .Check this demo page for a quick showcase http://appforgelab.com/vise Why Vise ? There is dozens of CSS frameworks available but why Vise ? - You may not need a heavy framework to build a great user experience. - You may want to use more than one framework on the same HTML document. - You may want a smarter and easier to learn minimal framework. - You need a library that is supported by 98% of web browsers. For docs and more visit Vise's github repository https://github.com/Appforge-lab/CSS-Vise

A powerful cross-platform UI toolkit for building native-quality iOS, Android, and Progressive Web Apps with HTML, CSS, and JavaScript. With a low friction migration, Ionic 6 brings improved desktop support, new UI components, iOS/Android design enhancements, performance and bundling improvements, and so much more. Free and open-source, Ionic offers a library of mobile-optimized UI components, gestures, and tools for building fast highly interactive apps. Ionic’s UI components look great on all mobile devices and platforms. Start with pre-made components, typography, and a base theme that adapts to each platform. Ionic lets developers to ship apps to the app stores and as a PWA with a single code base. With Adaptive Styling, apps look and feel at home on every platform. Create, build, test, and deploy your app with the Ionic CLI. Take advantage of Live Reload, deployments, integrations, and even use your favorite JS framework’s CLI.

JUCE is a C++ toolkit for building cross-platform applications on PC/Mac/Linux/iOS/Android. Particularly good for complex, customised GUIs and audio/midi processing, it also includes a vast range of classes to help with all your day-to-day programming tasks.

Semantic UI is a development framework that lets you create beautiful, custom and responsive website layouts using human-friendly HTML. The syntax used is based on natural language, so concepts are linked intuitively. Semantic UI utilizes concise HTML, intuitive JavaScript and simplified debugging, making front-end development an absolute dream for developers. Semantic UI is partnered with popular frameworks React, Angular, Meteor, Ember and many others so you can easily integrate it and organize your UI layer with your application logic. Semantic UI comes with over 3,000 high level theming variables and just about every layout option you can think of, giving you complete design freedom. It also has over 50 UI components enabling you to build your entire site with just one stack and share your UI between a number of different projects.

VasSonic is a lightweight and high-performance Hybrid framework developed by tencent VAS team, which is intended to speed up the first screen of websites working on Android and iOS platform. VasSonic is a lightweight and high-performance Hybrid framework developed by tencent VAS team, which is intended to speed up the first screen of websites working on Android and iOS platform. Not only does VasSonic supports the static or dynamic websites which are rendered by server, but it is also compatible with web offline resource perfectly. VasSonic uses custom url connection instead of original network connection to request the index html, so it can request resource in advance or parallel to avoid waiting for the view initialization. In this parallel case, VasSonic can read and render partial data by WebKit or Blink kernel without spending too much time waiting for the end of data stream.