Ionic is the open source HTML5 Mobile Framework for building amazing, cross-platform hybrid native apps and mobile websites with HTML, JavaScript, and CSS. If you know how to build or design websites, you will be able to build a real mobile app with Ionic.

Ionic - HTML5 Mobile Framework for building cross-platform hybrid native apps and mobile websites

React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components. With React Native, you don't build a “mobile web app”, an “HTML5 app”, or a “hybrid app”. You build a real mobile app that's indistinguishable from an app built using Objective-C or Java. React Native uses the same fundamental UI building blocks as regular iOS and Android apps.

React Native - A framework for building native apps with React.

Flutter is Google’s UI toolkit for building beautiful, natively compiled applications for mobile, web, and desktop from a single codebase. Flutter’s widgets incorporate all critical platform differences such as scrolling, navigation, icons and fonts, and your Flutter code is compiled to native ARM machine code using Dart's native compilers. 

Flutter - Framework for building high-performance, high-fidelity iOS and Android apps

Adobe PhoneGap framework is an open source distribution of Cordova. Reuse existing web development skills to quickly make hybrid applications built with HTML, CSS and JavaScript. Building applications for each platform–iPhone, Android, Windows and more–requires different frameworks and languages. PhoneGap solves this by using standards-based web technologies to bridge web applications and mobile devices.

PhoneGap - Build amazing mobile apps powered by open web tech

NativeScript is a framework for building native iOS and Android apps using JavaScript and CSS. It renders UIs with the native platform’s rendering engine, no WebViews, resulting in native-like performance and UX. It provides a best-of-both-worlds development experience, its cross-platform JavaScript modules give you the convenience of writing iOS and Android apps from a single JavaScript codebase, while its runtimes gives you the power of accessing native APIs, SDKs, and frameworks.

NativeScript - Build native iOS and Android apps using JavaScript

The Uno Platform is a UI Platform for building single-codebase applications for Windows, Web/WebAssembly, iOS, macOS, Android, and Linux.
It allows C# and WinUI XAML code to run on all target platforms while allowing you control of every pixel. It comes with support for Fluent, Material, and Cupertino design systems out of the box. Uno Platform implements a growing number of the WinRT and WinUI APIs, such as Windows.UI.Xaml, to enable WinUI applications to run on all platforms with native performance. It helps to reuse 99% of the business logic and UI layer across native mobile, web, and desktop.
Uno Platform-based applications on iOS, Android and macOS have exact same, native, performance as any other Xamarin-based application.
<ul>
<li dir="auto">On iOS, Android and macOS, Uno Platform relies on .NET to draw UI on canvas</li>
<li dir="auto">On WebAssembly, the Uno Platform relies directly on WASM runtime, a part of.NET</li>
<li dir="auto">On Linux, Uno Platform relies on Skia to draw the UI on canvas</li>
</ul>
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Uno is Open-source UI Platform for building single-codebase applications for Windows, iOS, Android, WebAssembly, macOS, and Linux

Uno - UI Platform for building single-codebase applications for Windows, iOS, Android, WebAssembly, macOS, and Linux

OpenMobster, is an open source Enterprise Backend for Mobile Apps. It provides a bi-directional data synchronization service for mobile apps to synchronize their locally stored database with Enterprise services in the Cloud such as server apps, CRM, ERP, etc.  It supports a platform-agnostic Cloud-initiated Push Notification System. It has framework for creating end-to-end Location Aware Apps.

 OpenMobster - Open Source Mobile Cloud Platform

Framework7 - is a free and open source mobile HTML framework to develop hybrid mobile apps or web apps with iOS & Android native look and feel. It is also an indispensable prototyping apps tool to show working app prototype as soon as possible in case you need to. The main approach of the Framework7 is to give you an opportunity to create iOS & Android apps with HTML, CSS and JavaScript easily and clear.
 
Framework7 is not compatible with all platforms. It is focused only on iOS and Google Material design to bring the best experience and simplicity.

Framework7 - is a free and open source mobile HTML framework to develop hybrid mobile apps or web apps with iOS & Android native look and feel. It is also an indispensable prototyping apps tool to show working app prototype as soon as possible in case you need to. The main approach of the Framework7 is to give you an opportunity to create iOS & Android apps with HTML, CSS and JavaScript easily and clear.

Framework7 - Full Featured HTML Framework For Building iOS & Android Apps

Weex provides the ability to publish cross platform, so web, Android, and IOS apps can use the same API development functions. At the same time, it provides a rich extension of the native interfaces. In this way, it will be very convenient when you need to extend native components or modules.
 
It is different from a "web app", "HTML5 app", or "hybrid app", you can use Weex to build a real mobile app. The code that you write is relatively simple, because you can build native applications just using HTML, CSS, Javascript. But underneath, the core of the application is Objective-C or Java. At the same time, Weex will provide a lot of native components or modules for developers to use.

Weex provides the ability to publish cross platform, so web, Android, and IOS apps can use the same API development functions. At the same time, it provides a rich extension of the native interfaces. In this way, it will be very convenient when you need to extend native components or modules.

Weex - A framework for building Mobile cross-platform UI

Codename One allows developers to write code once and have it work on all mobile devices. Code is developed in Java with full access to the underlying native OS. Codename One includes: an API, GUI Builder, Theme designer, Simulator, porting layers and an optional build cloud with cloud service offerings. 

Codenameone - Framework & Toolchain for cross platform mobile device development

Weex dedicates to enable developers to use modern web development experience to build both Android, iOS and web apps with a single codebase. In practice, you can use javascript and modern front-end frameworks to develop mobile apps after integrating the WeexSDK. The structure of Weex is decoupled, the render engines are separated from the syntax layer. Weex doesn’t rely on any specific front-end framework, it mainly supports Vue.js and Rax.

Weex - A platform for building Mobile Cross-Platform UI

Onsen UI is a library of UI components to help you create beautiful hybrid and mobile web apps for both Android and iOS using Javascript. It enriches the user’s experience for mobile web apps with natively designed UI elements. 
 
Under the hood, Onsen UI consists of three layers: 
<UL>
 <LI>CSS components, written in cssnext, the next generation of CSS.</LI>
 <LI>Web Components, written in native JavaScript to support ALL frameworks.</LI>
 <LI>Framework bindings, created for tighter integration with popular frameworks such as Vue.js, AngularJS 1, Angular 2+, and React.
</LI></UL>

Onsen UI is a library of UI components to help you create beautiful hybrid and mobile web apps for both Android and iOS using Javascript. It enriches the user’s experience for mobile web apps with natively designed UI elements. 

OnsenUI - Cross-Platform HTML5 Hybrid App Framework

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