Check out these classics and favorites of mine.

You can download all these games from GOG.COM which is a site where you can purchase classic games that are DRM-Free (no copy protection!) easy to use .exe (executable) files.
Heres is a list of some of my favs.

Blood 1 - A great games using the Build engine (first person shooter), you play as Caleb and the evil chernobog has your lady. it has a morbid horror theme and a great weapon selection like voodoo dolls, pitch forks, hairspray and lighter torch, dynamite, remote and proximity mines, tesla gun, napalm launcher and more! Check it out here: http://www.gog.com/en/gamecard/one_unit_whole_blood


Redneck Rampage- Another game using the Build engine, you play as a hillbilly on a rampage to stop that them there aliens critters! Hilarious voices and weapons like the bra machine gun is hilarious in it self, and you can even ride vehicles. Great game check it out here: http://www.gog.com/en/gamecard/redneck_rampage_collection

And more games like the Duke Nukem series, MDK, and more. at: http://www.gog.com