Back in the days when I was young, there was lots of fun small shareware and freeware games that we used to play with friends. I'm pretty sure we played them lot more than commercial games. Lots of fun with 3 players all on same keyboard. :P
So got a boost of nostalgia and dug some of those games up again. Sharing them here for your extra fun, most if not all of these are made by finns so might be unknown to rest of you but are all in english. Some of these games used to be shareware but all of them are now freeware, mostly dos games but few windows versions too.
Triplane Turmoil
[url=http://koti.mbnet.fi/~mvirpioj/wings/download/wings140.zip]Wings[/url]
Mine Bombers
Ultimate Tapan Kaikki
Liero
Molez
Alien Phobia 2
Have fun! :)

Aaah, Phobia 2! I have fond memories of that game (especially the keyboard not working properly for the second player ;-) Okay, of course not that).
Yeah, I remember those times...

Be sure to check out Liberated Games. A lot of commercial games have been re-released as freeware over the years for various reasons, and this site lists almost every one.

Did you play third one?

Yes, I have, but even that was some time ago.