Judge0 IDE is described as 'free and open-source online code editor that allows you to write and execute code from a rich set of languages. It's perfect for anybody who just wants to quickly write and run some code without opening a full-featured IDE on their computer' and is an app in the Development category. There are more than 100 alternatives to Judge0 IDE for a variety of platforms, including Windows, Linux, Mac, BSD and Online / Web-based. The best alternative is Visual Studio Code, which is free. Other great apps like Judge0 IDE are Notepad++ (Free, Open Source), Atom (Free, Open Source), Sublime Text (Free Personal) and Vim (Free, Open Source).
VS Code is more than just a code editor, it provides the tools and extensions to compile, debug, compare, refactor, and even manage code repositories all within a highly-customised development environment.
Zettlr is a supercharged markdown editor that combines many writing editor features and collect them in one application. It aims at speeding up your workflow and help you write without any interruptions.
Python and Django IDE with refactorings, code completion, on-the-fly code analysis and other features, including version control integration, deployment, integration with issue trackers, and remote debugging.