Apps similar to Opa include Angular, which is free and open source. Other options are Meteor, Express, KnockoutJS and FeathersJS. There's no shortage of Software Frameworks like Opa, with more than 25 alternatives for Linux, Mac, Windows, self-hosting and the web.
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...
Enact is an app development framework built atop React that’s easy to use, performant and customizable.
MontageJS is a modern, full stack HTML5 framework designed to create single-page applications—fast! MontageJS uses time-tested design patterns and software principles, allowing you to easily create a modular architecture for your projects and help deliver a high-quality user...
flatiron is an adaptable framework for building modern web applications. It was built from the ground up for use with Javascript and Node.js.
Gem.js gives you a way to create modular, composable web components and modular, composable styles in pure-javascript. It also includes a set of extensible web components for building visual user interfaces and styling web applications.
Serenade.js is a client side framework built on the MVC pattern. It makes it simple to create rich client side applications by freeing you from having to keep the DOM up to date with your data through powerful data bindings.
A rich framework for building web applications and services. hapi is a simple to use configuration-centric framework with built-in support for input validation, caching, authentication, and other essential facilities.
An opinionated, battle-tested Backbone + Handlebars framework to build large scale web applications.
Small & fast DOM and event library for modern browsers. Having the same familiar API as jQuery (but without the extra "weight" of modules like $.ajax, $.animate, and $.Deferred), it works great stand-alone or paired up with e.g. Backbone.
Lumen is the stunningly fast micro-framework by Laravel. Use the Laravel features you love like Eloquent, caching, queues, validation, routing, middleware, and the powerful Laravel service container. All with almost zero configuration.
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AmplifyJS is a set of components designed to solve common web application problems with a simplistic API. Amplify's goal is to simplify all forms of data handling by providing a unified API for various data sources.
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