MEAN vs Apache Sling: What are the differences?

Developers describe MEAN as "A Simple, Scalable and Easy starting point for full stack javascript web development". MEAN (Mongo, Express, Angular, Node) is a boilerplate that provides a nice starting point for MongoDB, Node.js, Express, and AngularJS based applications. It is designed to give you a quick and organized way to start developing MEAN based web apps with useful modules like Mongoose and Passport pre-bundled and configured. On the other hand, Apache Sling is detailed as "Innovative web framework that is intended to bring back the fun to web development". It is a framework for RESTful web-applications based on an extensible content tree. It maps HTTP request URLs to content resources based on the request's path, extension and selectors. Using convention over configuration, requests are processed by scripts and servlets, dynamically selected based on the current resource. This fosters meaningful URLs and resource driven request processing, while the modular nature of Sling allows for specialized server instances that include only what is needed.

MEAN and Apache Sling can be primarily classified as "Frameworks (Full Stack)" tools.

MEAN is an open source tool with 11.9K GitHub stars and 3.58K GitHub forks. Here's a link to MEAN's open source repository on GitHub.