Santools. They have SCSI/SAS fibrechannel, SATA diags including JBOD (SES) enclosure management, firmware flashing, full SES, statistical log page dumps, even threshold monitoring. http://www.santools.com/smart/unix/manual
They have ports for LINUX, Solaris, IRIX, HP-UX, basically all the unix versions, as well as Windows, all with various 32 and 64-bit builds. Last time I checked, pricing was $90 USD for single copy.