Closed source?
IntelliJ: https://github.com/JetBrains/intellij-community
PyCharm: https://github.com/JetBrains/intellij-community/tree/master/...
Android Studio: https://android.googlesource.com/platform/tools/adt/idea/+/r...
Yes, they might offer extended proprietary editions/plugins in addition, but the IDEs themselves are open source.
Oh, this is great!
I've filed bugs with JetBrains before and had them take months getting to my ticket, often with multiple hand-offs between team members; being able to provide a potential fix should make the process much faster.
None of these are the "norm". The IDEs OC mentioned all have a much larger install base.
Do all of those installed on my various machines for the express purpose of a last resort of building some obscure crap about once a couple years count? Because of course I have them installed.. somewhere. And of course I wouldn't imagine using that crap daily.