Free Software
Yelp
Yelp is a crowd-sourced local business review and social networking platform. At Yelp, users can submit a review of their products or services using a one to five star rating system. As of Q4 2017 Yelp had 141 million monthly unique visitors and 148 million reviews. Yelp is used by people around the world to located the best restaurant, hotel, and businesses in the area.
TripAdvisor
Tripadvisor is an online travel platform with user-generated content. It offers online hotel reservations as well as bookings for transportation, lodging, travel experiences, and restaurants. It features approximately 859 million reviews and opinions on approximately 8.6 million establishments. Tripadvisor is available on the web and natively for mobile.
Pug.js
Pug or Pug.js is a free and open-source, high-performance template engine for Node.js. The library is heavily influenced by Haml and share many of the same concepts, while being a JavaScript implementation.
Underscore.js
Underscore.js is a free and open-source JavaScript library that provides over 100 functional programming helpers without extending any built-in objects. Underscore.js can be used for function binding, javascript templating, creating quick indexes, deep equality testing, and much more.
Webiny
Webiny is a free and open-source static site generator and headless CMS written in JavaScript.
Mocha.js
A simple, flexible, and feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. With Mocha, you can run tests serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases.
Vest
Vest is a free and open-source validations library for JavaScript applications. The library share many similarities with other testing framework such as Mocha and Jest. It is to write validation testing with Vest as it includes already common declarative patterns. The library can handle validation upon user interaction and user input.
Envira Gallery
Envira Gallery is a WordPress plugin that can be used to create a gallery for your Wordpress-powered website. With Envira Gallery you can showcase images to your visitors with ease. Envira Gallery is also avalible for the WordPress.com platform if you are signed up on a business plan.