JHipster is a Yeoman generator, used to create a Spring Boot + Angular project. Its goal is to generate for you a complete and modern Web app. It provides a high-performance and robust Java stack on the server side with Spring Boot, A sleek, modern, mobile-first front-end with Angular and Bootstrap and a powerful workflow to build your application with Yeoman, Webpack/Gulp and Maven/Gradle.

JHipster - Create  Spring Boot + Angular projects in seconds

Ratpack is a set of Java libraries for building modern HTTP applications. It provides just enough for writing practical, high performance, apps. It is built on Java 8, Netty and reactive principles. It is similar to NodeJS, helps to implement non blocking HTTP apps in Java.


Ratpack - A toolkit for JVM web applications

Javalin is a very lightweight web framework for Kotlin and Java, inspired by Sparkjava and koa.js. Javalin is written in Kotlin with a few functional interfaces written in Java. This was necessary to provide an enjoyable and near identical experience for both Kotlin and Java developers.
<ul>
 <li>Lightweight - You don’t have to learn any advanced concepts to get started</li>
 <li>Consistent API - All handlers and mappers are void and operate on the Context (ctx)</li>
 <li>Almost identical API for both Kotlin and Java</li>
 <li>Not opinionated - A library rather than a framework (you never have to extend anything)</li>
 <li>Fully customizable embedded server (Jetty)</li>
 <li>JSON-object-mapping (via Jackson)</li>
 <li>Simple per-endpoint auth via <code class="highlighter-rouge">AccessManager</code> interface</li>
 <li>Simple static file handling</li>
 <li>Lifecycle events</li>
 <li>CookieStore - An easy way to serialize and store objects in cookies</li>
 <li>Template rendering (Velocity, Freemarker, Thymeleaf, Mustache)</li>
 <li>Markdown rendering</li>
</ul>

Javalin is a very lightweight web framework for Kotlin and Java, inspired by Sparkjava and koa.js. Javalin is written in Kotlin with a few functional interfaces written in Java. This was necessary to provide an enjoyable and near identical experience for both Kotlin and Java developers.

Javalin - A Simple REST API Library for Java / Kotlin

Vaadin is a Java framework for building modern web applications. It helps to create Rich Internet Applications faster. It has dozens of in-built UI component like Button, Tree etc which is event driven. Vaadin browser widgets is built on GWT and it support all Ajax-capable browsers. Developers need to know only Java and no JavaScript or XML knowledge is required. It is integrated with Eclipse and Netbeans IDE. It runs on all popular Application servers.

Vaadin is a Java framework for building modern web applications. It helps to create Rich Internet Applications faster. It has dozens of in-built UI component like Button, Tree etc which is event driven. Vaadin browser widgets is built on GWT and it support all Ajax-capable browsers.

Vaadin - Web Framework to build Rich Internet Application

Struts is a Web Framework which uses Model-View-Controller (MVC) architecture. The Model represents the business or database code, the View represents the page design code, and the Controller represents the navigational code.
  Struts works well with conventional REST applications, SOAP and AJAX.

Struts - Java Web Framework

Pyjs is a Rich Internet Application (RIA) Development Platform for both Web and Desktop. It contains a Python-to-Javascript compiler, an AJAX framework and a Widget Set API. Pyjs started life as a Python port of Google Web Toolkit (GWT), the Java-to-Javascript compiler. Additional to the web framework, they have Desktop version of Pyjs called Pyjs Desktop. It allows the same web application source code to be executed as a standalone desktop application instead of being stuck in a Web browser.

Pyjs - Python Web Application Framework

Bootique is a minimally opinionated java launcher and integration technology. It is intended for building container-less runnable Java applications. With Bootique you can create REST services, webapps, jobs, DB migration tasks, etc. and run them as if they were simple commands. No JavaEE container required! Among other things Bootique is an ideal platform for Java microservices, as it allows you to create a fully-functional app with minimal setup.

Bootique - Minimally opinionated platform for modern runnable Java apps

Tide is a friendly HTTP server built for casual Rustaceans and veterans alike. It's completely modular, and built directly for async/await. Whether it's a quick webhook, or an L7 load balancer, Tide will make it work. Each Tide endpoint takes a Request and returns a Response. Because async functions allow us to wait without blocking, this makes Tide feel similar to synchronous servers. Except it's incredibly efficient.

Serve the web – HTTP server framework

The goal of this project is to create a micro web framework in Java that should be easy to use and hack. Pippo can be used in small and medium applications and also in applications based on micro services architecture. Also, Pippo comes with a very small footprint that makes it excellent for embedded devices (Raspberry Pi for example).

pippo - Micro Java Web Framework

Jooby a scalable, fast and modular micro web framework for Java. Write your application in Java or JavaScript. It supports  Express.js, Sinatra, Scripting programming model. It also supports Spring like MVC model. NIO web servers, Caching, Web sockets, Dependency Injection and lot more.


Jooby - A Scalable, fast and modular micro web framework for Java

RESTX is the lightweight, modular, feature rich, blazing fast, open source Java REST framework. It shares similarities with modern frameworks like Play! like hot compile and a very productive experience, but focused on REST and pure Java.
 
It is focused more on Rest. This implies that it’s not a general web framework, i.e., there is no templating mechanism. It’s better use with a JavaScript framework on the client side, and you can always use any other templating mechanism to serve your pages.

RESTX is the lightweight, modular, feature rich, blazing fast, open source Java REST framework. It shares similarities with modern frameworks like Play! like hot compile and a very productive experience, but focused on REST and pure Java.

RESTX - the lightweight Java REST framework

Griffon is desktop application development platform for the JVM. Inspired by Grails, Griffon leverages concepts like Convention over Configuration, modularity, and freedom of choice. The framework at its core is written 100% in Java allowing developers to write their own applications with only Java. Other programming languages such as Groovy and Kotlin may be used too, in which case additional capabilities such as builders and extension methods become available.
 
Griffon encourages the use of the MVC pattern. Griffon also follows in the spirit of the Swing Application Framework (JSR 296), it defines a simple yet powerful application life cycle and event publishing mechanism. Another interesting feature comes from the Groovy language itself: automatic property support and property binding (inspired by BeansBinding (JSR 295)), which makes creating observable beans and binding to their properties a snap! As if property binding was not enough Groovy’s SwingBuilder also simplifies building multi-threaded applications, say goodbye to the ugly gray rectangle (the bane of Swing apps)!

Griffon is desktop application development platform for the JVM. Inspired by Grails, Griffon leverages concepts like Convention over Configuration, modularity, and freedom of choice. The framework at its core is written 100% in Java allowing developers to write their own applications with only Java. Other programming languages such as Groovy and Kotlin may be used too, in which case additional capabilities such as builders and extension methods become available.

Griffon - Next generation desktop application development platform for the JVM

Xenon is a framework for writing small REST-based services. (Some people call them microservices.) The runtime is implemented in Java and acts as the host for the lightweight, asynchronous services. The programming model is language agnostic (does not rely on Java specific constructs) so implementations in other languages are encouraged. The services can run on a set of distributed nodes. Xenon provides replication, synchronization, ordering, and consistency for the state of the services. Because of the distributed nature of Xenon, the services scale well and are highly available.
 
Xenon is a "batteries included" framework. Unlike some frameworks that provide just consistent data replication or just a microservice framework, Xenon provides both. Xenon services have REST-based APIs and are backed by a consistent, replicated document store.
 
The lightweight runtime enables the creation of highly available and scalable applications in the form of cooperating light weight services. The operation model for a cluster of Xenon nodes is the same for both on premise, and service deployments.

Xenon is a framework for writing small REST-based services. (Some people call them microservices.) The runtime is implemented in Java and acts as the host for the lightweight, asynchronous services. The programming model is language agnostic (does not rely on Java specific constructs) so implementations in other languages are encouraged. The services can run on a set of distributed nodes. Xenon provides replication, synchronization, ordering, and consistency for the state of the services. Because of the distributed nature of Xenon, the services scale well and are highly available.

Xenon - Decentralized Control Plane Framework

QEWD is a Node.js-based platform for developing and running interactive browser-based applications and Web/REST services. QEWD makes use of the ewd-qoper8 module to provide an isolated run-time environment for each of your message/request handler functions, meaning that your JavaScript handler functions can use synchronous, blocking APIs if you wish / prefer.

QEWD - Quick and Easy Web Development

Spincast is a framework to serve as a backend for Single Page Applications (SPA), to develop old-school HTML generated websites or to be a REST API services platform. Spincast aims to feel more like a library than like a framework. It is not opinionated and favors configuration over convention. Its main goal is to give power to the developers. 

Spincast is an highly flexible and open source Java web framework, based on Guice

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