OmniOS on the other hand is pretty solid and with pkgsrc (default package system on SmartOS and NetBSD) you get nearly 13k packages of open-source software.
My List is also missing a few other commercial players that use and contribute to Illumos:
- Delphix, uses ZFS snapshots to do fancy things with big databases
- Pluribus has "Netvisor OS" that is some SDN Router/Networking appliance [3]
And then there is the long tail of small hobby distributions:
- Tribblix, "Retro with modern features" [4]
- DilOS, which has a focus on Xen and Sparc [5]
and probably more that I forgot and don't know.
It is a very nice community and lots of interesting technology gets developed. Our company migrated nearly all servers from Linux to SmartOS in the last 2 years and we could not be happier.
[1] http://wiki.openindiana.org/oi/Hipster
[2] http://pkgsrc.joyent.com/installing.html#installing-on-illum...