Finding a language that requires no additional packages is pretty hard, the only solution I can think of off the top of my head would be writing HTML/Javascript apps that are run in a browser (as long as it's all client side code there's no reason you couldn't distribute an app this way, but functionality will probably be very limited).
However, you there are some redistributable packages you can include with your software (for example,
.Net 2.0 Redistributable Package[
^]) to install it on the end user's machine.