Blitzkrieg, Sudden Strike & Stalingrad (2000-2017).SWAT 4 + SWAT Elite Force & First Responders (2005) - SP & MP PvE + PVP (free!).SWAT 3: Close Quarters Battle (1999) - SP-only.Rainbow Six 3: Raven Shield (2003) - SP and MP PvE (free!).
Hideous Destructor (2007) - SP & MP PvE.