I remember being told it was Line6 on extreme mode.
Off the top of my head that hasn't already been mentioned, Soundgarden, Lamb of God, Nevermore, Devildriver, Cannibal Corpse, Buckethead, George Lynch, The Darkness, Faith No More, Testament, Meshuggah, No-FX, Shinedown, Sevendust, BTBAM, Dååth, Thrice, Killswitch Engage, No Use For a Name, Incubus, Linkin Park, Limp Bizkit....
Additionally, lots of bands blended them in the studio, even if it wasn't part of their live sound.
To add to the confusion, Some bands used them live because they were a common backline, even if it wasn't part of their studio sound.
Running both a Recto and JVM together was pretty popular for awhile.
Lots of bands used Recto 4x12s, even if they didn't use Rectifiers.