For the past twenty or more years the technology of the spear-thrower has become more and more well-known as a sport. Popularly called an atlatl in the Americas as that was the name the Nahuatl-speaking Aztecs gave it. This is a world-wide technology and arguably one of the greatest technological leaps for early modern humans. I feel fortunate to have lived through this increasing popularity and to see the growth of the sport.
Have a look at some remarkable throwers recreating an ancient training game reported to be from South America.
For a more European take on the subject, check out speerschleuders at this fine German website. Finally, possibly the oldest image of a spear thrower in action from Lascaux Cave.