Preferans
Play-On-Smart
Преферанс
Advance Corp.
Изаак Дмитрий Давыдович
Mobius Grant
Brain Fitness Ltd
evvsoft.com
Preferans: Online Card Game
CASUAL AZUR GAMES
Preference LiveGames online
NanoFlash LLC
SmartPref Pro
SmartPref OÜ
Ultimate Preferans