Urban legend says that Mona Lisa's eyes follow you as you move around the room. If you enable your webcam, the eyes of this digital portrait will do just that.
Speaking of AI: Hans manages to teach birds new tricks, like cleaning up his garden.
The ThreeJS based Keyboard Simulator allows you to design and test virtual keyboards using a number of different layouts and keyboard features, along with a whole slew of color themes.
If you want to create the next Dwarf Fortress, Damien Guard has a nice rundown of old 8-bit fonts.
And for good measure I'll throw in some eyecandy by isladjan and Sabin Tudor.