I love Thomas Biskup's free RPG ADOM. It is a lovingly crafted masterwork which has a depth of gameplay I have never seen anywhere else (and thats saying something). The man is a saint for providing the world with this product for nothing besides postcards.
All that being said though I have one and only one complaint about his free ice cream (for those of you who don't know "free ice cream" is something of an in-joke here at JU) : The man makes maddening updates at a a totally random and wildy erratic schedule. Check out his most recent post here wherein he promises to update again in 15 days (21 days ago). Once he promised an update within a week and went away for 6 months! Honestly I think he is a marketing genius who uses this ploy to drive anticipation to fever pitches. Grrrr... Damn you Thomas! Damn you and your excellent and free game! (go download it if you have no fear of losing more free time than World of Warcraft takes up)