Opa is described as 'Open source, simple and unified platform for writing web applications. All aspects are directly written in Opa: Frontend code, backend code, database queries and configuration. And everything is strongly statically typed' and is an app in the development category. There are more than 25 alternatives to Opa for a variety of platforms, including Linux, Mac, Windows, Self-Hosted and Web-based apps. The best Opa alternative is Angular, which is both free and Open Source. Other great apps like Opa are Meteor, Express, KnockoutJS and FeathersJS.
Sails.js make it easy to build custom, enterprise-grade Node.js apps. It is designed to mimic the MVC pattern of frameworks like Ruby on Rails, but with support for the requirements of modern apps: data-driven APIs with scalable, service-oriented architecture.
Aurelia is a JavaScript client framework that leverages simple conventions to empower your creativity.
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.
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.
v8cgi is a server side (FastCGI or Apache module) and client side shell/batch scripting language. It's based on Google's V8 JavaScript implementation. It's available under an Open Source BSD license.
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.
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.
Pedestal is a web application framework written in Clojure that aims to bring both the language and its principles to client and server-side development.
Free web application framework for building Web sites and Web applications using JavaScript, HTML and CSS.
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.
Chaplin is an architecture for JavaScript applications using the Backbone.js library. Chaplin addresses Backbone’s limitations by providing a lightweight and flexible structure that features well-proven design patterns and best practices.
Twisted is an event-driven network programming framework written in Python and licensed under the MIT License. Twisted projects variously support TCP, UDP, SSL/TLS, IP Multicast, Unix domain sockets, a large number of protocols (including HTTP, XMPP, NNTP, IMAP, SSH, IRC, FTP...
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