Grails

vs

ASP.NET Core

Django is a high-level Python web development framework used for building web application at scale with speed. The framework adhere to a clean and pragmatic design that lets developers develop rapidly. Django ships as a "batteries included" framework and contains many of the features needed for most web applications such as an admin panel, an ORM and templating language. It takes much of the hassle out of web development and lets developers focus on writing their application instead of focusing on authentication, authorization and security.

Ruby on Rails is an iconic, free and open source, server-side web application framework released under the liberal MIT license. The Ruby-based framework has helped millions of developer make their ideas a reality. The framework is opinionated and promotes best standards and practices for web development. When combining that with a community that is open, helpful and guiding, it's not hard to see why Ruby on Rails is one of the most loved web application frameworks to this day. Ruby on Rails is also used by industry giants like Basecamp, HEY, GitHub, Shopify, Airbnb, Twitch, SoundCloud, Hulu, Zendesk, Square, Cookpad.

A framework designed to make it easy to build web applications with Java & Scala.  The Play Framework is is based on a lightweight, stateless, web-friendly architecture that follows a model-view-controller (MVC) pattern. While providing predictable and minimal resource consumption (CPU, memory, threads) suitable for highly-scalable applications.  Play is written in Scala and can be used for all programming languages that can be compiled into JVM bytecode.