OpenSolaris
Used by 4 peopleoracle.com ↗
“We have a set of servers from HP and IBM that are running OpenSolaris and several versions of Linux and Windows.”
Gene Spafford Interview, Professor (Purdue University), security expert · via Uses This 
“It runs OpenSolaris and has 5 2Tb drives: mirrored with a hot spare for a total of 4Tb of usable storage.”
James Gosling Interview, Software engineer (Java) · via Uses This
