Blogman
Broadway Big Band or Vienna Symphonic Library Saxes.... Buy em! You won't regret. At least I haven't regretted buying them. I use both regularly.
Both amazing, and I don't have either unfortunately :-)
I use the Samplemodeling saxes, they are also up there ... certainly not free though !.
Here's one you might want to check out - has a "Demo Download" which is always helpful.
It's a hundred bucks - I'm tempted to grab it to expand my Sax sounds.
http://www.linplug.com/saxlab.html It covers you for the entire Sax range, I haven't tried it out yet because in the middle of too much stuff right now.
Cheers - Cliff