Cost / License
- Freemium
- Proprietary
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Chrome OS
- iPad
- Software as a Service (SaaS)

Koa is described as 'Expressive middleware for node.js using generators via co to make web applications and APIs more enjoyable to write. Koa's middleware flow in a stack-like manner allowing you to perform actions downstream, then filter and manipulate the response upstream' and is a Web Framework in the development category. There are more than 50 alternatives to Koa for a variety of platforms, including Linux, Mac, Windows, Self-Hosted and Web-based apps. The best Koa alternative is Django, which is both free and Open Source. Other great apps like Koa are Supabase, Angular, Firebase and Ruby on Rails.

Durandal is a cross-device, cross-platform client framework written in JavaScript and designed to make Single Page Applications (SPAs) easy to create and maintain.
Grails is a high-productivity web framework based on the Groovy language that embraces the coding by convention paradigm, but is designed specifically for the Java platform.
The Famous Engine is a free and open source JavaScript rendering engine. What makes the Famous Engine unique is its JavaScript rendering engine and 3D physics engine that gives developers the power and tools to build native quality apps and animations using pure JavaScript.
Real-time communication service for connecting online devices. Infrastructure and APIs for IoT, gaming, apps and real-time web.

Both Knockout.js and Backbone.js have their strengths and weaknesses, but together they are amazing! With Knockback.js, you can use the strong ORM provided by Backbone and create dynamic views using Knockout bindings.
Free web application framework for building Web sites and Web applications using JavaScript, HTML and CSS.
Harp is a production-ready web server. Rapidly build static sites and client-side applications using , and more—no configuration necessary.
The Harp Platform is the easiest way for anyone to create an exceptional website. Landing Pages, galleries, blogs, e-commerce, domains, hosting, analytics, 24/7 support - all included.
Silex - The PHP micro-framework based on Symfony2 Components
Silex is a PHP microframework for PHP 5.3. It is built on the shoulders of Symfony2 and Pimple and also inspired by sinatra.
A microframework provides the guts for building simple single-file apps. Silex aims to be:
.

Ractive.js is a template-driven UI library that transforms your templates, styles and logic into blueprints for highly interactive apps. Ractive.js works for you, not the other way around. You do not need to learn new terminologies, concepts, and methodologies.