- Admiral Owners Forum
- Alpha Catamarans Owner's Forum
- Broadblue Owners Forum
- Catalac Owners
- Catana Owners Forum
- Chris White Cats
- Dazcats
- Dean Catamarans
- Discovery Owners Forum
- Dolphin Owners Forum
- Dragonfly Trimarans
- Edel Catamarans
- Endeavourcat Owners
- Eric Lerouge Cats
- Fastcat Owners Forum
- Fountaine Pajot Owners Forum
- Fusion Catamarans
- Galileo Catamarans
- Gemini Owners Forum
- Heavenly Twins Owners Forum
- Hirondelle Owners
- Iroquois Owners Forum
- Knysna Boats Owners Forum
- Lagoon Owners Forum
- Leopard Owners Forum
- Lightwave Owners Forum
- Maine Cat Owners Forum
- Maverick Owners Forum
- Maxim Owners
- Nautitech Owners Forum
- Nexus Owners Forum
- Nordic Cats
- Ocean Catamaran Owners Forum
- One-off Cats
- Outremer Owners Forum
- PDQ Owners Forum
- Privilege Owners Forum
- Proas
- Prout Owners Forum
- Richard Woods Designs Forum
- Schionning Owners Forum
- Searunner Class
- Seawind Catamarans
- Simpson Catamarans
- Solaris Catamarans
- St Francis Owners Forum
- Switch Owners Forum
- Voyage Owners Forum
- Wharram Owners Forum