Joyent SmartOS is now being maintained by MNX and the GitHub repositories have moved to https://github.com/TritonDataCenter
They don't seem to be a huge player like Sun/Oracle, Joyent/Samsung though.
I really wish them well, I loved that stack -- but I wouldn't bet on that stack anymore. I moved storage to FreeBSD, (internet) networking to OpenBSD and VM's live on proxmox when I am running actual hardware.
Otherwise, $cloud.
However, Linux (and containers running on Linux) ate everyone's lunch.
Samsung wanted to enter the Public Cloud Space, ( The kind of business they would be interested in ), but their NAND and DRAM division would suffer order reduction from hyper scalers. In the end they sort of back off this segment of business.