Shrapnel Games and the Camo Workshop have released annual updates for winSPMBT (Steel Panthers: Main Battle Tank) and winSPWW2 (Steel Panthers: World War II).

winSPMBT: http://www.shrapnelgames.com/Camo_Workshop/MBT/MBT_page.html
winSPWW2: http://www.shrapnelgames.com/Camo_Workshop/WW2/WW2_page.html