hapi is described as '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' and is an app in the Development category. There are more than 50 alternatives to hapi for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Self-Hosted solutions. The best alternative is jQuery, which is both free and Open Source. Other great apps like hapi are AngularJS (Free, Open Source), ExpressJS (Free, Open Source), Meteor (Free, Open Source) and Polymer (Free, Open Source).
Polymer is a library that uses the latest web technologies to let you create custom HTML elements. Build anything from a button to a complete application as an encapsulated, reusable element that works across desktop and mobile.
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 ).