Some ships in this page are pre-WC1 ships (i.e.: pre-2654), and they are duly noted; but the page is titled “pre-war” simply because the majority of the ships listed in it are, in fact, pre-war era ships (pre-2634).
Most of what we know about pre-war era ships comes from the novel Action Stations.
See also Wikipedia's Pre-WC1 Kilrathi ships, and Pre-WC1 Confed ships pages.

NOTE: The age notes in parenthesis are relative to the year 2634, unless otherwise noted.

• Fighters (What's a Fighter?)
• Bombers (What's a Bomber?)
• Transports (What's a Transport?)
• Corvettes (What's a Corvette?)
• Destroyers (What's a Destroyer?)
• Frigates (What's a Frigate?)
• Carriers (What's a Carrier?)
• Cruisers (What's a Cruiser?)
• Dreadnoughts (What's a Dreadnought?)
• Other...

• (Confed) Corsair fighter (NOT “pre-war”, but rather pre-WC1; —i.e. not in service yet, in 2634)
• (Confed) Falcon heavy fighter/bomber (in service)
• (Landreich) Gotha surface to space interceptor (presumably an old Confed interceptor; still in service in the Landreich)
• (Confed) Hawk atmospheric fighter (in service)
• (Confed) Hummer light recon and strike planes (in service)
• (Confed) Hurricane dual role escort fighter (old, but still in service)
• (Kilrathi) Kala fighter (latest model)
• (Confed) Minotaur large, atmo capable craft (ancient)
• (Kilrathi) Vak fighter (old, picket role escorts aboard Targu frigates)
• (Confed) Wildcat pure space interceptor (latest model but past end of service, awating replacement by Corsair's)

• (Kilrathi) Asjaka three-seater bomber (presumably old)
• (Confed) Falcon "heavy bomber" (speculative concoction)
• (Confed) Gladiator bomber, space to ground (old, perhaps some are still in service)
• (Kilrathi) Gomora heavy strike bomber (latest model)
• (Confed) Trident heavy bomber, transatmospheric (still in service)

• (Kilrathi) Tugar transport (ancient)
• (Confed) Victory class transport (pre-WC1; not pre-war)
• (Confed) Wasp, (single-gunned) personnel transport (a “relic”)

• (Confed) Cutter heavy corvette (fan-mod added, PU)
• (Confed) Falcon light corvette (“old” by 2668; nothing else known)
• (Confed) Granicus medium corvette (pre-WC1, discontinued circa 2645)

• (Confed) Valiant destroyer (ancient)
• (Kilrathi) Unnamed class standard destroyer in 2634 (in service)

• (Kilrathi) Targu frigate (pretty old, used in picket roles)
• (Confed) Unnamed class, standard frigate in 2634 (in service)
• (Kilrathi) Unnamed class, standard frigate in 2634 (in service)

• (Confed) Concordia class fleet carrier
• (Confed) Ranger class light carrier
• (Kilrathi) Unnamed class standard carrier in 2634 (in service)
• (Kilrathi) Unnamed class converted cruiser in 2634 (in service)

• (Kilrathi) Butha cruiser (ancient)
• (Kilrathi) Unnamed class cruiser in 2634 (in service)
• (Kilrathi) Unnamed class old cruiser (from Varni war, but still in service)

• (Kilrathi) Gamorin class battleship (late model, but more of a battlecruiser than a battleship)
• (Kilrathi) Yar class battleship (old but good, still in service)
• (Confed) Unnamed class, standard battleship in 2634 (in service)
• (Kilrathi) Zulu class battleship (late model, in service)

• (Confed) Sheridan Marine Landing Craft (presumably still in service)
• (Wu) Unknown Class Wu ship (ancient)