There are 4 repositories under illumos topic.
All the UNIX and UNIX-Like: Linux, BSD, macOS, Illumos, 9front, and more.
Unified build system for OpenIndiana distribution components
Community developed and maintained version of the OS/Net consolidation
Make your Linux/macOS/BSD/illumos machine visible in Network view of Windows Explorer
Nomad task driver for Illumos zones.
the history, present state and some ideas for the future of the core dump routines in FreeBSD
Avant-garde Network Application Server for illumos.
SmartOS / illumos / Solaris port of Envoy; A C++ front/service proxy
Reviving Sun's adjoin-s10u5 (Solaris) application to join illumos to Active Directory 2012 or 2016
Hopefully a Vagrant Plugin which could be used to managed zones on illumos (OmniOSce)