Visual Studio Code (VSCode) is used widely at ACCESS-NRI. It is a very powerful and flexible cross-platform open-source code development program developed by Microsoft.
The power and flexibility comes in large part from the wide variety of available extensions (plugins).
One of those extensions is Live Share
It enables easy live sharing of your code with one or more people. All participants need to run VS Code, which is free, cross-platform and easy to install.
Pair-coding is a great way to learn and write better code, and Live Share makes this easy to do, no matter where you might be located.