

Actually, at least for Quake, you can use the shareware version (which afaik IS included in the vitaQuake release zip)You need to own the data files for both games and place them in the appropriate directories (ux0:/data/Quake/id1 for Quake, and ux0:/data/Hexen II/data1 for Hexen).
You'll have to find the data files on your own, as they're warez and they are NOT allowed to be posted or asked for here.