To each developer their own favorite stack. As for me, the short version is that I develop with Python and Django mainly, and my projects are hosted on Debian servers that I manage myself. For the longer version, I list below the software and tools that I use on a regular basis.
Django is a web framework written in Python. It rocks.Python
Django REST framework
A toolkit for building web APIs with Django.Python
A Content Management System written in Python and powered by Django.Python
Angular is a front-end framework written in TypeScript, with cross-platform development in mind.TypeScript
Systems and services
Debian, Debian everywhere. This community-driven GNU/Linux distribution can run on pretty much anything.
A free and open-source relational database management system.
Web server, reverse proxy, load balancer. Nginx does it all.
Python application server. Because Nginx does not speak Python.
Certificate authority providing TLS encryption for free. It adds the S to HTTP to make it Super. And Secure.
Scientific computing with Python.Python
A documentation generator written in Python.Python
LaTeX / Beamer
What you see is what you type. What you get is a beautiful, consistent document.
unittest / Selenium / tox / Flake8 / Coverage.py
Python testing stack.Python
Jasmine / Protractor / Karma / TSLint
(S)CSS linter. Because inconsistencies cascade too.SCSS
Debug panels for Django.
A distributed version-control system.
GitLab is a complete DevOps platform: Git repositories, issue tracking, CI/CD, and more.
Visual Studio Code, but without Microsoft's functionalities.
The web browser.
Free and open-source vector graphics editor.
Free and open-source raster graphics editor.