It looks like sgi has finally retired the freeware site as it just redirects to the corporate front page now. I FTP'd to ftp.sgi.com to see if the old stuff is still there and it is. But who knows for how long. Hopefully someone with the resources mirrors the FTP site if it hasn't been done already.
rhaegar
daenerys
viserys
aegon
:MacBook:
snow
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I also mirrored some parts of ftp.sgi.com and oss.sgi.com. There was too much extraneous crap in there to just grab everything, but I made sure to grab certain items of interest like inventor, performer, etc. If you don't see something mirrored that you think should be, send me a PM or make a note here and I'll pull it down.