YRIE XI (“Orbis Factor”) is quite popular, and was specifically recommended for congregational singing in an article by Dr. William Mahrt. I confess to have wrongly neglected this chant in recent years because I prefer a more ancient version found in the “Ad Libitum” section of the Liber Usualis. I searched for a recording of this Kyrie online, but wasn’t happy with what I heard.
So here’s my attempt: