I'm a big user of Pythonista on an iPad. I also use Continuous[0] for editing C# files, and occasionally play around with Replete[1] (a ClojureScript REPL for iOS).

Obviously they aren't JetBrains/Visual Studio class, but for the specific things they do while I'm on the go they're fantastic. This is increasingly the way I'm doing things with code and text. When I want to open Excel, however- that's when things start falling down for me.

[0]: http://continuous.codes/ [1]: https://replete-repl.org/