Sun's web server? Just use apache; works great on Solaris!
Actually, iirc apache is what Sun supplies, but it's a fairly old version. Late last year I did an upgrade for an ISP customer who was replacing some old pizza boxes with new rackmount servers, and going from Solaris 7 to 8 in the process. The apache was quite a few revisions back so we just installed the latest source and built it.
Lots of the tools you may need (e.g. gcc) are available as precompiled binary distributions at:
www.sunfreeware.com