Buffalo is a Go web development eco-system. Designed to make the life of a Go web developer easier. Buffalo starts by generating a web project for you that already has everything from front-end (JavaScript, SCSS, etc...) to back-end (database, routing, etc...) already hooked up and ready to run. From there it provides easy APIs to build your web application quickly in Go.
 
Buffalo uses Gorilla toolkit to manage routes, sessions, cookies. It has ORM support to handle relational and non-relational databases. Regarding templates, it has support for <a href="https://github.com/gobuffalo/plush" target="_blank" rel="noopener">Plush</a> which has Rails-like syntax.
 
Buffalo helps you to define test suites. Action, resource, model generators create test templates for the code you just generated.

Buffalo is a Go web development eco-system. Designed to make the life of a Go web developer easier. Buffalo starts by generating a web project for you that already has everything from front-end (JavaScript, SCSS, etc...) to back-end (database, routing, etc...) already hooked up and ready to run. From there it provides easy APIs to build your web application quickly in Go.

Buffalo - Rapid Web Development for Go

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints. It uses OpenAPI for API creation, including declarations of path operations, parameters, body requests, security, etc. It produces interactive API documentation and exploration web user interfaces. 

FastAPI - Web framework for building APIs with Python

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

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

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

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

Rocket is an async web framework for Rust with a focus on usability, security, extensibility, and speed. It helps to create and return potentially infinite async streams of data with ease, View, add, or remove cookies, with or without encryption, without hassle, It makes templating a breeze with built-in templating support, Rocket typechecks route URIs for you so you never mistype a URI again.
 
Rocket has first-class support for JSON, right out of the box. Simply derive Deserialize or Serialize to receive or return JSON, respectively. Handling forms is simple and easy. Simply derive FromForm for your structure and let Rocket know which parameter to use. Rocket parses and validates the form request, creates the structure, and calls your function.

Rocket is an async web framework for Rust with a focus on usability, security, extensibility, and speed. It helps to create and return potentially infinite async streams of data with ease, View, add, or remove cookies, with or without encryption, without hassle, It makes templating a breeze with built-in templating support, Rocket typechecks route URIs for you so you never mistype a URI again.

Rocket - A web framework for Rust

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

Fiber is an Express inspired web framework built on top of Fasthttp, the fastest HTTP engine for Go. Designed to ease things up for fast development with zero memory allocation and performance in mind. New gophers that make the switch from Node.js to Go are dealing with a learning curve before they can start building their web applications or microservices. Fiber, as a web framework, was created with the idea of minimalism and follows the UNIX way, so that new gophers can quickly enter the world of Go with a warm and trusted welcome.

Fiber - Express inspired web framework written in Go

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