In my research for yesterday's history of ice cubes I looked into the various companies that are making cocktail-specific ice, but didn't write much about them so I thought the least I could do is list them here.
Some are scultpure ice companies that end up delivering to cocktail bars, while others are bartender-created start-ups.
Feel free to add others that you know about in the comments, noting that we're looking for companies that create cocktail ice, not solely ice sculpture companies.
Mammoth Ice - Sydney, Australia (Ships to Australia)
On the Rocks Ice – Vancouver, Canada
Eskimo Ice – London, England
Ice Cubed, Manchester, England
Crystal Group – Paris, France
h-eis - Dresden, Germany
IsCompaniet – Stockholm, Sweden
Park Island Ice Department – Stockholm, Sweden
Custom Craft Ice Sculpting – Arizona
Chisel-it Ice – Concord, CA
IceBulb – Los Angeles, CA
Penny Pound Ice – Los Angeles, CA
Cold Star Ice - Santa Ana, CA
JustIce – Chicago, IL
Brookline Ice Co. – Boston, MA
Hundredweight – NYC
Ice Occasions - Las Vegas, NV
PDX Ice – Portland, OR
Cape Cod Ice – East Providence, RI
The Cold Standard – Dallas, TX (no website)
Glace Luxury Ice – Ships to the US
Standard Ice - Greenville, NC
An index of all of the ice experiments on Alcademics can be found here.