Freeware for Solaris
Life with Solaris (dead link) offered downloads for multimedia applications for Solaris, like VLC.
Blastwave - Open Source Software for Solaris and OpenSolaris
OpenCSW is an easy to use open source software distribution installable on top of Solaris and Solaris-based systems. OpenCSW is a community project dedicated to working closely with upstream projects to improve portability of open source software.
Stoyan Angelov's page offers a lot of links and downloads to Sun hardware and software (Solaris) documentation.
Oracle - Oracle and Sun Microsystems
WeSunSolve (closed)
BigAdminBlog (dead link)
Patch Corner (dead link)
Bryan Allen:
overflow dumping core for fun and profit
mirrorshades reflections on infrastructure management and other shiny bits
bryan allen just another bithead
The {Geek} Diary - Solaris Performance troubleshooting : Disk (I/O) performance issues
Solaris Disk Check
unixadminschool.com - Solaris Troubleshooting : Confirming Disk Failures in Solaris
Stackexchange - Unix & Linux - What happened to Primary Administrator profile in Solaris 11?
sysstat - Solaris' key system statistics at a glance
GitHub - alhazred/solaris-scripts Solaris System Administration scripts from BigAdmin and other public sources.