www.sun.com Sun's own WWW site, contains pointers to Sunsites, patches and has lots of info, press releases etc, etc.
www.sun.com/downloads/ Solaris software catalogue, pointers to free software, downloadable software from Sun, etc, etc.
Many, many Solaris 8+ binaries in pkg format
Solaris 2.x/SPARC binaries in pkgadd format
Solaris 2.x/x86 binaries in pkgadd format
SunSites - Sun sponsored sites. Lots of good stuff there.
Sun SITE AskERIC at Syracuse University - Syracuse
Sun SITE Australia at Australian National University - Canberra
Sun SITE Central Europe at RWTH-Aachen - Germany
Sun SITE Chile at Universidad de Chile - Santiago
Sun SITE Czech Republic at Charles University - Prague
Sun SITE Denmark at Aalborg University - Aalborg
Sun SITE Digital Library at University of California at Berkeley
Sun SITE France at Conservatoire National des Arts-et-Metiers - Paris
Sun SITE Hong Kong at University of Science and Tech. - Hong Kong
Sun SITE Hungary at Lajos Kossuth University, Debrecen - Hungary
Sun SITE Italy at University of Milan - Milan
Sun SITE Israel at Hebrew University of Jerusalem - Jerusalem
Sun SITE Japan at Science University - Tokyo
Sun SITE Korea at Seoul National University - Seoul
Sun SITE Mexico at Universidad Nacional Autonoma de Mexico - Mexico
Sun SITE Nordic at Kungliga Tekniska Högskolan - Stockholm
Sun SITE Northern Europe at Imperial College - London
Sun SITE People's Republic of China at Tsinghua University - Beijing
Sun SITE Poland at Warsaw University - Warsaw
Sun SITE Russia at Moscow State University - Moscow
Sun SITE Thailand at Assumption University - Bangkok
Sun SITE Spain at Consejo Superior de Investigaciones Cientificas, RedIRIS - Madrid
Sun SITE Singapore at National University of Singapore - Singapore
Sun SITE South Africa at University of the Witwatersrand - Johannesburg
Sun SITE USA at University of North Carolina - Chapel Hill
ftp.x.org - the master X11 site
ftp.quintus.com:/pub/GNU - GNU binaries
ftp.uu.net - UuNet communication archives
(mirrors abovementioned GNU binaries in systems/gnu/solaris2.3)
prep.ai.mit.edu and the GNU mirrors
Joe Shamblin's x86 site at Duke
server.berkeley.edu:/pub/x86solaris - x86 stuff