Synful has an entire modelled orchestra (except percussion).

It's actually a form of sample resynthesis (through additive synthesis) in realtime, it's not fully modelled by means of a physical model, at least as far as I understand it.

(1) http://www.synful.com/Sounds/Synful_Pla...Spring.mp3
(2) http://www.synful.com/Sounds/HeldenLeben.mp3

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Wallander WIVI models all the wind instruments (brass and woods). Again: you wouldn’t turn to this if the utmost in realism is what you’re after, but expertly programmed and wisely mixed, this software is capable of pretty amazing things.

(1) http://www.wallanderinstruments.com/mus...renade.mp3
(2) http://www.wallanderinstruments.com/mus...artita.mp3
(3) http://www.wallanderinstruments.com/mus...Around.mp3

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Sample Modelling started out making so-called hybrid instruments — part sampled, part modelled —, their solo trumpet being, in my opinion, a still unequalled work of genius, but their latest releases (the solo strings) are all 100% modelled.
As is to be expected, the timbre is prone to raise a few eyebrows here and there, but the expressive possibilities of these instruments are far beyond what samples can deliver.
If there’s any developer, besides Modartt, that deserves to be closely watched, as far as modeling instruments goes, it is Sample Modelling.

(1) http://www.sample-modeling.com/Demos/St...ggetti.mp3
(2) http://www.sample-modeling.com/Demos/St...Livera.mp3
(3) http://www.sample-modeling.com/Demos/St...merson.mp3

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IK Multimedia recently came out with a very impressive engine for modelling electric bass guitar: MODO.

NI Reaktor has a few ‘ensembles’ that do instrument modelling. Some of them surprisingly good.

AAS Chromaphone is *very* good at modelling melodic percussion. Really great synth.

Arturia Brass, which Joe already mentioned, is another one of those ‘physical modelling’ initiatives (and there have been many) which had promise — at least, as far as the trumpet and trombone were concerned; the saxes being, alas, incomprehensibly bad — but it doesn’t look like this will ever be further developed.

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I have a demo version (free trial) of this guitar modeling software.  I think it is very good.

Lanny

Having tinkered with Arturia Brass (trumpet, trombone and sax), the concept looks nice on paper, but falls far short in practice.

A long time ago, Yamaha corporation had marketed a hardware modeled tenor (or alto ?) saxophone.   It played one note at a time only (as was befitting a wind instrument),  and consisted of a keyboard and required a breath controller.  Most notably, it would squeak and squawk if played with too much air pressure in the breath controller.   I saw it way back in the 1980's when the Consumer Electronics Shows were still held in Chicago.  It was supposedly a look into the future, but I never saw much come of it.

An Italian electronic organ maker, whose brand shall remain nameless, marketed a modeled pipe organ in 2005.  I tried it at the 2005 Winter NAMM show in Anaheim, California -- again, it was a nice try, and looked good on paper.  Needless to say, I found the sounds to be thin and completely lacking in realism.

If there are modeled stringed instruments, I haven't heard of anything of note.

Cheers,

Joe