Classes they likely had access to I guess.
Well, all Successor States had a dozen+ of the older model
Aegis-class Heavy Cruiser. Some, if not all, also used the
Baron-class Destroyer, and apparently the
Vigilant-class Corvette.
We know the Lyran Commonwealth had at least one
Potemkin-class Troop Cruiser, in addition to their
Mako-class Corvettes and
Tharkad-class Battlecruisers.
The Federated Suns had access to the
Congress-class Frigate, in addition to their
Robinson-class Transports and
Davion-class Destroyers (and a homegrown Battleship class IIRC).
The Capellan Confederation had the
Du Shi Wang-class Battleship.
The Free Worlds League had the
Atreus-class Battleship.
The Draconis Combine had the
Samarkand-class Carrier.
The Taurian Concordant used
Wagon Wheel-clas Frigates,
Winchester-class Cruisers, and the
Dart-class Light Cruiser, IIRC.
All the houses were likely to have additional classes of ships, but these are ones that are easily confirmed by a review of the House books and TRO's.
Ruger