https://www.openra.net/ (Free, but a little big buggy)

WarFare Incorporated:

http://www.warfareincorporated.com/index.html (IOS, Free)

https://play.warfareincorporated.com/ (Web Only)

Command and Conquered Remastered:

https://store.steampowered.com/agecheck/app/1213210/

Oh sorry, thought you wanted RTS instead of RPG. :)