There are more and more all the time. Even Elev8 Premier makes colors using other companies’ colors. EP only makes lined colored tubing.
Northstar (One of the first)
Trautman Art Glass TAG
Boro Batch (ABR Imagery)
Greasy Glass
Hand of Man Tubing
Fun House Glass
Taffy Tubes
Momka Color
New Color Company (Parramore)
Origin Glass
Asian Color
Indian Color