Classes I have competed in:

Sunfish (competed at a World Championships)
Weta Trimaran
J22 (Worlds)
J24 (Worlds)
Tartan 10 (Nationals)
Express 27 (Nationals)
NA40 (NAs)
Ultimate 20
One Ton (World Championships)
Maxi Class (World Championships)
OD35 (Worlds, Nationals)
Melges 32
Melges 30 (Nationals)
Melges 24 (Worlds)
Melges 20 (Nationals)
Melges 17 (Nationals)
Melges 14 (Midwinters)
E Scow (Nationals)
MC Scow
Butterly (Nationals)
Blokart (World Championships)
DN Iceboat (World Championship)
Etchells 22 (Nationals)
Lightning (Pan Am Games)
Snipe
FAST 40
TP52
S2 7.9 (Nationals)
JY15 (Nationals)
VX One Design (Nationals)
F18 Catamaran (Worlds)
A Class Catamaran (Nationals)
Tornado
470 (Olympic trials)
Mistal Equipe Windsurfing (Worlds)
Mistral Superlight Windsurfing
Moth
Mumm 36 (Nationals)
Hobie 16
Hobie 18 Turbo
49er
Nacra 17 (Nationals)
J120
J35
Hundreds of lead bottomed, shameful custom IOR, IMS and PHRF keelboats (how embarrassing).
RC (EC12, Marblehead, IOM, DF65, DF95, multihull)
…dozens more I cannot recall now…
…I will add them as they come to mind…