Hmm, let's see
Titan Quest or TorchLight if you like Diablo-esque games.
The Witcher 1&2, for WRPGs.
There is CitiesXL which seems to be a good city builder like SimCity.
Just to name a few.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.