A very nice overview of chords per scale.
World's ONLY Complete Piano Chord Chart
Available as poster if you buy the book, or you can order the poster if you live in America (to send that poster overseas is idiotically expensive).
Available as free pdf, with a watermark on the poster.
Available as paid pdf, without the watermark.
The two pdfs come with 2 sizes printable versions of the poster.
There are some more handy posters on that website, but this was exactly the one I was after. A nice full overview of the chords per scale.