Best freeware games

[songnar]

Alright, we've all played them and I'd gladly say that somewhere around 90% of them are either unoriginal or crap, however, everyone has their own opinion and because I like hearing my peers squawk theirs I'll go on and ask - what is/are your favorite freeware game(s)?

I can assure you that so far I have not found a better free series than the Chzo Mythos (5 days a Stranger, 7 days a skeptic, etc...)

 

[OnlyWonderBoy]

I Wanna Be The Guy anyone?

It quite possible may be the most frustrating game you will ever play. Hard but with practice it's fun as hell. Plus there's tons of reference to old school NES games. I never could pass up a good reference. Not for people who hate being cheated by games, but to it's credit it usually does it in a funny matter with odd death traps.

 

[shadebreeze]

Do games that used to be proper retail games but have now been released as freeware count?

In that case, "One Must Fall 2097" is a must play.
"The Ur-Quan Masters" as well, if you like old-style DOS games.