FreeGameDev

This is a freeware adventure game based on the King's Quest series.

http://www.tsl-game.com/

It is very professionally done (at least, looking at the visuals). Since I don't have a half-decent Windows machine, it is unlikely I will be able to play it though.

Another freeware adventure game based on another popular classic series, Zack McKfracken: Between Time and Space, has been complete for a while but only available in German. The English version is getting nearer though and they have a new website:

http://www.mckracken.net/

Didn't they have like copyright issues or something?

Yes, but then they were allowed to release the game if they don't use "King's Quest" in the title. ^^