For the cream of the crop, you'll obviously want to go and check out: AGS Award Winners
If you're interested in games that do interesting stuff with the engine, make sure to check out the games that were nominated for or won "Best Programming" or "Best Non-Adventure". Some highlights among those are:
Colourwise by bicilotti
Adventures in the Galaxy of Fantabulous Wonderment by Yahtzee
Art of Theft by Yahtzee
TiLTOR
The Jackyard by Hofmeier
Plumberboy
One that appears to have skipped getting even nominated, but is really great, is IAMJASON
Aside from that, one of my personal favourites, although a fairly traditional adventure game, is The Winter Rose.
If you're interested in games that do interesting stuff with the engine, make sure to check out the games that were nominated for or won "Best Programming" or "Best Non-Adventure". Some highlights among those are:
Colourwise by bicilotti
Adventures in the Galaxy of Fantabulous Wonderment by Yahtzee
Art of Theft by Yahtzee
TiLTOR
The Jackyard by Hofmeier
Plumberboy
One that appears to have skipped getting even nominated, but is really great, is IAMJASON
Aside from that, one of my personal favourites, although a fairly traditional adventure game, is The Winter Rose.