Play darts against people online. You can play 501 darts matches and chat with your opponent as you play.
Pub Darts 3D Multiplayer has a nice physics engine and 3D graphics. The darts can collide and occasionally hit each other or the wires and fall out which helps to create realistic and addictive gameplay.
The game includes the rules for 501 darts and has simple controls. Simply aim with the mouse and hold down the left mouse button before releasing when the 'accuracy circle' is at its smallest.