Quadtech and CEET are a few, off the top of my head
I think Quad Tech may be closed. I have seen a few posts on other forums about it. Last week I tried multiple times to call, phone would just ring, no answer, not even anyway to leave a message.
Years ago I had CEET desert foam, was very firm, but held up good.
I have also heard Jettrim does good work, but no personal experience.
Doug