Alden Lee
Maker of fine hardwood furniture for early musicians, including music stands, instrument stands, players' seating, and others.  Located in Menlo Park, California.

Clarion Associates
The largest insurance firm dedicated solely to the needs of musicians worldwide.  Located in Huntington Station, New York.

Musicmakers Kits
Makes and sells kits for making all manner of early instruments.  Located in Stillwater, Minnesota.