Use simple text on a 3D view? I´m looking for a way to present information (simple text) that can be typed into a panel with text input. The panel is active on the session but it will be displayed on the 3D viewport all the time.
Like this:


On softimage we called these "notes" and it was an extra item on the collection. 
I don´t know where to start looking, since the original code is not part of Blender for doing this. I used this function a lot in softimage.
Please help.
Thanks.
Maybe the closest thing you will get to that is making a text editor window.  Any of the blender panels can be changed to many different windows. One of the options is a text editor.  It won't however, overlay on top of the 3D viewport.