Miroire from Orchestral Tools is one of the few ones. It contains ‘quite reasonable’ Violins and Violas, Oboes, Flutes, Trumpets and Horns, and a generic ‘Basso Continuo’ instrument that’s doubled Cello and Contra, plus bassoon.
It suffers from a number of problems: the sustain only lasts 5 seconds; there’s no pizz artics and OT libraries can be difficult to control in Dorico. I think I’ve finally got command of it now (But I need to update the Ex maps and template I’ve posted here, yet again!)
I also use another OT library: Tableau, which is a string quartet, but the Cello, set to no Vibrato, works well with the Miroire strings as an alternative to the Basso instrument, as here:
For theorbo, I use Garritan’s GPO5 Harpsichord, set to the Buff stop!