For typing in polytonic Greek, I have found nothing more handy than the free Emacs, an amazing text editor.
Emacs contains within it changes of input method. I can shift back and forth easily in the same document with a key stroke, Control-. This makes it easy to type a Greek passage, and then annotate it in English, the language in which I know the grammar terms. I can change to polytonic Greek, and back to regular English typing without bothering with the operating system, because Emacs contains this capability within itself.
I can go to Perseus in my browser and load the NT book of Acts, in the browser. Then I easily copy book 2 of acts into Emacs. I use the grammar and dictionary aids in Perseus, still in my browser, and copy the needed information into the file in Emacs.
Some find Emacs daunting, because there is so much of it. But it’s like a big city; only taxi drivers really know everything. To everybody else, it’s like a few neighborhood-islands connected by streets and mass transit. To begin, you need to know how to load and save a file. You can pick that up from the menus.
You can get it here: