KeyWack is described as 'game for people with babies and small children who like to sit at their parent’s computer and bang the keyboard'. There are five alternatives to KeyWack for Mac, Windows, iPad, iPhone and Linux. The best alternative is Baby Smash!, which is free. Other great apps like KeyWack are Baby Computer Fun (Free), bambam (Free, Open Source), G is for Gadget (Paid) and AlphaBaby (Free).
As babies smash on the keyboard, colored shapes, letters and numbers appear on the screen. Baby Smash will lock out the Windows Key, as well as Ctrl-Esc and Alt-Tab so your baby can't get out of the application.
Let babies and toddlers have fun playing with the computer. An educational game for people with babies and small children who like to sit at their parent's computer and smash the keyboard. Every time a key is pressed, a letter is drawn.
AlphaBaby lets even infants and toddlers have fun playing with the computer. Every time a key is pressed or the mouse is clicked, a letter or shape is drawn. Sounds can be played every time something is drawn. Your own sounds and pictures can also be used.