i don't have RaspberryPi, but i'm user of Puppy Linux for x86 (Slackware version - Slacko), u should have an app called Puppy Package Manager (try to find in Setup menu), from this app u can install apps that are being packaged for Puppy, the current repository is here (the same like from app):
http://distro.ibiblio.org/quirky/arm/pe ... ges-armv6/
and u can download package and install manualy by clicking on it, eventually u can allways try to install packages for Debian Squeezy as Puppy for Pi is based on this version of Debian