This game has a demo so good, you'll beg to give them your money for more, and you can! A great example of how every game should be available prior to purchase.

Free Alien Swarm RTS Mod based in the Half-Life 2 universe.

"Has Demo"

Full free game, co-op for up to 4 players. Made by Valve. This is the first free game I have recommended. I will include more in the future. Try it.

"Has Demo."

"Has Demo."

"Has Demo."

"Has Demo."

"Has Demo."

"Has Demo."