Helpful websites (to me)

Websters DADGAD Starter Kit

Lots of helpful information concerning DADGAD and Celtic Music
http://www.webstersguitaracademy.com/wp-content/uploads/2016/03/DADGAD-Starter-Kit.pdf

Han Speek
https://hspeek.home.xs4all.nl/dadgad/examples.html

This is the chart which I like most on his site. He also has a really huge chord-chart, but there are too many chords on it imho. But these chord scales are really helpful because the chords are laid out in a musical way.

Simon Fox - playdadgad.com

Here you find 18 easy chords. You'll also find a large collection of chords if you wish to.
http://www.playdadgad.com/dadgad/chords/html/Chords/Basics/Basics.html

Guitarplayer

An introduction to DADGAD Martin Simpson style

https://www.guitarplayer.com/technique/dadgad-for-dummies-psst-you-already-know-50-percent-of-this-tuning

Michael Eskin

http://www.tradlessons.com/michaeleskin/DADGAD.html

Simple chords to backup celtic music
http://www.tradlessons.com/michaeleskin/DADGAD.pdf

Michael Sizer Watt

Some chords and information using DADGAD accompanying celtic music

https://michaelsizerwatt.wordpress.com/category/guitar-songbacking-for-traditional-irish-music/


Celticguitarmusic

another chord chart

http://www.celticguitarmusic.com/dadgad.htm