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OpenSolaris source is in an archived repo: https://github.com/kofemann/opensolaris
You're familiar with this project, right? https://www.illumos.org/ It is a continuation of Open Solaris, and is 100% open source. There is a subreddit for IllumOS. There are a couple very usable systems based on that code base as well. i.e. a stable server OS https://omnios.org and rolling release desktop/multi-purpose OS https://openindiana.org Both run the Solaris kernel and tools. If UNIX and operating systems development really interests you, you might also look at BSD UNIX. SunOS version 4 was based on BSD UNIX. Solaris (aka SunOS 5) was a hybrid BSD/SystemV OS. If I were just starting out learning UNIX operating system code, I would start with Minix (an OS written with teaching OS design in mind) and NetBSD (carefully minted OS to run on any architecture, developed slowly because of its high coding standards).