It's simple python console based on IronPython.net You can pretty much execute any command, method, change variables, create objects all in play mode

I've build it on top of https://github.com/exodrifter/unity-python

https://karolwieczorek.github.io/Projects/PythonConsole/help

Required Unity 2017.2 It could work on older Unity versions but it wasn't tested

To test in editor just open scene

Assets/Scenes/main.unity 

and hit play.

It was tested on Windows build, WebGL is not working as far as I know other platforms not tested yet