... It's not this one. It's Ken Perlin's personal website. The Oscar-winning (!) NYU Professor has published over 100 experiments - Java applets that load directly from the page - on his site. Actors, crowd behavior, texture, input, texture, board games, casual games... Almost every interesting topic is covered by one (or more) of his experimental demos. Maybe the post title is not quite right, since it's not exactly a nongames website, but it's filled with brilliant sandbox, free-play experiences.
A huge source of inspiration, Perlin's website certainly has something that will make you think of interesting design possibilities.