Fastify is described as 'An efficient server implies a lower cost of the infrastructure, a better responsiveness under load and happy users' and is an app in the Development category. There are more than 50 alternatives to Fastify for a variety of platforms, including Windows, Linux, Mac, Self-Hosted solutions and Online / Web-based. The best alternative is ExpressJS, which is both free and Open Source. Other great apps like Fastify are Meteor (Free, Open Source), Nest (Free, Open Source), ember.js (Free, Open Source) and Crow (Free, Open Source).
You can write less code with Ember's Handlebars integrated templates that update automatically when the underlying data changes. Ember.js incorporates common idioms so you can focus on the development of your application ( and not reinventing the wheel ).
Crow is a C++ microframework for running web services. It uses routing similar to Python's Flask which makes it easy to use. It is also extremely fast, beating multiple existing C++ frameworks as well as non C++ frameworks. Features
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.
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.