Sites not sponsored by Sun, accessible for all:
ugle.unit.no:/pub/unix/sun-fixes
ftp.luth.se:/pub/unix/sun/all_patches
SunSites (carry recommended and security patches):
sunsite.unc.edu:/pub/sun-info/sun-patches
sunsite.sut.ac.jp:/pub/sun-info/sun-us/sun-patches
sunsite.doc.ic.ac.uk:/sun/sunsite-sun-info/sun-patches
Sunsolve:
sunsolve1.sun.com:/pub/patches
http://sunsolve1.sun.com/
These are Sun's own sites, they has the recommended patches up for anonymous ftp, packaged as one huge 2.x_Recommended.tar.Z file and as individual patches.
Starting with SunSolve CD 2.1.2 ALL Sun patches are shipped on the SunSolve CD.
Contract customers can get all patches by ftp from Sunsolve or via e-mail and query one of the online sunsolve-databases on the Internet.