I'm a huge fan of Visual Studio Code, and luckily I have the privilege of installing it on my laptop. But if you are not as lucky, or if you're looking for a SaaS solution, then our partner Microsoft has annouced Visual Studio Online.
While it's still in private preview mode, there are a number of exciting features in the pipeline - one of the killer features will facilitate pair programming.
Have a look at this blog post for more information.
There's no need for the online version!
It's free and built on open source
A collaborative learning environment, enabling open source skill development.