RESTEasy is a JBoss project that provides various frameworks to help you build RESTful Web Services and RESTful Java applications. It is a portable implementation of the JAX-RS specification. JAX-RS is a JCP specification that provides a Java API for RESTful Web Services over the HTTP protocol. It is portable to Tomcat and many other app-server. It has rich set of providers for: XML, JSON, YAML, Fastinfoset, Multipart, XOP, Atom, etc.

RESTEasy - Rest Framework for Java

Swagger is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs. The goal of Swagger is to define a standard, language-agnostic interface to REST APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. 

Swagger - The World's Most Popular API Framework

Quarkus is a Cloud Native, Container First framework for writing Java applications. A Kubernetes Native Java stack tailored for GraalVM &amp; OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Quarkus tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. It allows developers to automatically generate Kubernetes resources including building and deploying container images without having to manually create YAML files.
Quarkus is based on a&nbsp;<a href="https://quarkus.io/version/main/guides/quarkus-reactive-architecture" target="_blank" rel="noopener">reactive core</a> allowing your application to mix reactive and imperative components. It helps to compose asynchronous operations and complete the result when everything is done without blocking the I/O threads using <a href="https://quarkus.io/version/main/guides/mutiny-primer" target="_blank" rel="noopener">Mutiny Reactive API</a>.&nbsp;&nbsp;

Quarkus is a Cloud Native, Container First framework for writing Java applications. A Kubernetes Native Java stack tailored for GraalVM & OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Quarkus tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. 

Quarkus - Supersonic Subatomic Java

Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web services. It pulls together stable, mature libraries from the Java ecosystem into a simple, light-weight package that lets you focus on getting things done. 
 
Dropwizard has out-of-the-box support for sophisticated configuration, application metrics, logging, operational tools, and much more, allowing you and your team to ship a production-quality web service in the shortest time possible.
 
Dropwizard straddles the line between being a library and a framework. Its goal is to provide performant, reliable implementations of everything a production-ready web application needs. Because this functionality is extracted into a reusable library, your application remains lean and focused, reducing both time-to-market and maintenance burdens.

Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web services. It pulls together stable, mature libraries from the Java ecosystem into a simple, light-weight package that lets you focus on getting things done. 

dropwizard - A damn simple library for building production-ready RESTful web services.

Ktor is a framework for quickly creating web applications in Kotlin with minimal effort.Ktor Framework doesn't impose a lot of constraints on what technology a project is going to use – logging, templating, messaging, persistent, serializing, dependency injection, etc. Sometimes it may be required to implement a simple interface, but usually it is a matter of writing a transforming or intercepting function. Features are installed into application using unified interception mechanism which allows building arbitrary pipelines.
 
Ktor Application can be hosted in any servlet container with Servlet 3.0+ API support such as Tomcat, or standalone using Netty or Jetty. Support for other hosts can be added through the unified hosting API. Ktor pipeline machinery and API is utilising Kotlin coroutines to provide easy-to-use asynchronous programming model without making it too cumbersome. All host implementations are using asynchronous I/O facilities to avoid thread blocking.

Ktor is a framework for quickly creating web applications in Kotlin with minimal effort. Ktor Framework doesn't impose a lot of constraints on what technology a project is going to use – logging, templating, messaging, persistent, serializing, dependency injection, etc. Sometimes it may be required to implement a simple interface, but usually it is a matter of writing a transforming or intercepting function. Features are installed into application using unified interception mechanism which allows building arbitrary pipelines.

Ktor - Framework for quickly creating connected applications in Kotlin with minimal effort

Spark is a micro framework for creating web applications in Kotlin and Java 8 with minimal effort. It is a simple and expressive Java/Kotlin web framework DSL built for rapid development. Sparks intention is to provide an alternative for Kotlin/Java developers that want to develop their web applications as expressive as possible and with minimal boilerplate. With a clear philosophy Spark is designed not only to make you more productive, but also to make your code better under the influence of Spark’s sleek, declarative and expressive syntax.

Spark - A simple expressive web framework for java

Light 4j is a fast, lightweight and cloud native microservices framework. Light means lightweight, lighting fast and shed light on how to program with modern Java SE. It is 44 times faster than the most popular microservices platform Spring Boot embedded Tomcat and use only 1/5 of memory. 
Its features include: 
<ul>
<li>Plugin architecture for startup/shutdown hooks and middleware components</li>
<li>Distributed OAuth2 JWT security verification as part of the framework</li>
<li>Request and response validation against OpenAPI specification at runtime</li>
<li>Metrics collected in influxdb and viewed from Grafana Dashboard for both services and clients</li>
<li>Global exception handling for runtime exception, api exception and other checked exceptions</li>
<li>Mask sensitive data like credit card, sin number etc. before logging</li>
<li>Sanitize cross site scripting for query parameters, request headers and body</li>
<li>Audit to dump important info or entire request and response.</li>
<li>Body parser to support different content types</li>
<li>Standardized response code and messages from configuration file</li>
<li>Externalized configuration for all modules for dockerized environment</li>
<li>CORS pre-flight handler for SPA (Angular or React) from another domain</li>
<li>Rate limiting for services that exposed outside to the Internet</li>
<li>Service registry and discovery support direct, Consul and Zookeeper</li>
<li>Client side discovery and load balance to eliminate proxies</li>
<li>A client module that is tightly integrated with Light-OAuth2 and supports traceability</li>
</ul>

Light 4j is a fast, lightweight and cloud native microservices framework. Light means lightweight, lighting fast and shed light on how to program with modern Java SE. It is 44 times faster than the most popular microservices platform Spring Boot embedded Tomcat and use only 1/5 of memory.

light-4j - A fast, lightweight and more productive microservices framework

Ninja is a full stack web framework for Java. It is made up of libraries that deliver everything. From Html, Json and Xml rendering and parsing to management of different environments, database persistence, testing and much more.
 
<ul>
 <li>Web friendly. Restful architecture. Simple programming model.</li><li>Plain vanilla Java. Dependency Injection. First class IDE integration.</li><li>Super fast development cycles.</li><li>Simple and fast to test (Mocked tests / Integration tests).</li><li>Excellent build and CI support.</li><li>Simple JSON consumption and rendering for clean RESTful APIs.</li><li>HTML rendering / Form submission validation and parsing.</li><li>Built-in support for authentication of users.</li><li>Not much bytecode magic. Clean codebase - easy to extend.</li>
</ul>

Ninja is a full stack web framework for Java. It is made up of libraries that deliver everything. From Html, Json and Xml rendering and parsing to management of different environments, database persistence, testing and much more.

Ninja - Ninja is a full stack web framework for Java

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

Nameko is a microservices framework for Python that lets service developers concentrate on application logic and encourages testability. Developer can focus on business logic and write regular Python methods and classes to implement your service. Nameko will manage connections, transports and concurrency for you.
 
Nameko gives you effortless concurrency by yielding workers when they wait for I/O, leaving you free to handle many requests without the worry of threading. Nameko is compatible with almost any protocol, transport or database. Simply use the built-in extensions, build your own or leverage the community.

Nameko is a microservices framework for Python that lets service developers concentrate on application logic and encourages testability. Developer can focus on business logic and write regular Python methods and classes to implement your service. Nameko will manage connections, transports and concurrency for you.



Nameko - A Microservice framework for Python

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

Rest.li is a REST+JSON framework for building robust, scalable service architectures using dynamic discovery and simple asynchronous APIs. Rest.li fills a niche for building RESTful service architectures at scale, offering a developer workflow for defining data and REST APIs that promotes uniform interfaces, consistent data modeling, type-safety, and compatibility checked API evolution.

Rest.li - REST+JSON framework

Apollo is a set of Java libraries that we use at Spotify when writing microservices. Apollo includes modules such as an HTTP server and a URI routing system, making it trivial to implement restful API services. Apollo has been used in production at Spotify for a long time.

Apollo - Java libraries for writing composable microservices

Micronaut is a modern, JVM-based, full stack microservices framework designed for building modular, easily testable microservice applications. Micronaut is developed by the creators of the Grails framework and takes inspiration from lessons learnt over the years building real-world applications from monoliths to microservices using Spring, Spring Boot and Grails.
 
Micronaut apps startup in tens of milliseconds with GraalVM. It features a Dependency Injection and Aspect-Oriented Programming runtime that uses no reflection. Micronaut's Cloud support is built right in, including support for common discovery services, distributed tracing tools, and cloud runtimes.

Micronaut is a modern, JVM-based, full stack microservices framework designed for building modular, easily testable microservice applications. Micronaut is developed by the creators of the Grails framework and takes inspiration from lessons learnt over the years building real-world applications from monoliths to microservices using Spring, Spring Boot and Grails.

Micronaut  - A modern, JVM-based, full-stack framework for building modular, easily testable microservice and serverless applications

Helidon is a collection of Java libraries for writing microservices that run on a fast web core powered by Netty. It supports MicroProfile and provides familiar APIs like JAX-RS, CDI and JSON-P/B. Our MicroProfile implementation runs on fast Helidon Reactive WebServer. It can easily integrate with Prometheus, Jaeger/Zipkin and Kubernetes.

Helidon - Java libraries for writing Microservices

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