Disclaimer: I am always looking for that Unicorn. The one that will let me write my code once and run it on all platforms. I refuse to give up this quest.
I use Pycharm and have used other Jetbrains IDE's in the past. They make me soooo very happy to use. That is, I have tried almost every Python IDE and suped up Vim/Emacs; None of them came close to Pycharm for me. They know cross platform. Their IDE's are just as bad ass on the macOS as they are on Windows... again, for me.
They make IDE's for just about everything and I assume they are all of stellar quality. My assumption, as of about 30 minutes ago, is that Kotlin could be a great bet for cross platform development in the near, near future. Jetbrains has every reason for this language to succeed in as many places as possible. Web, Mobile and Desktop. The fact that it runs on the JVM and compiles to JS out of the box makes me wonder why I haven't tried it yet.