This is perhaps the primary site, and much of this comes with the regular Solaris packages for Solaris 10.
blastwave.org Community SoftWare (CSW)
This is another good side, with the very nice (usually) feature that their packaging automatically includes all the packages that the target depends upon.
Once in a while this is a pain, if there are many dependencies and they conflict with other software. There may be more removes and replacements than you expected in your wildest dreams.