You can convert the Debian package into a generic .tar.gz by using alien.

I considered putting a tarball on the web site, but the pppd binary has been linked against the libcrypt shared library which I would also need to distribute, and I'm uncertain about possible (albeit ridiculous) U.S. export restrictions on this library.

As far as I know, as long as you have the necessary shared libraries, only the pppd binary is needed to run PPP using the PPP kernel - a Debian environment should not be required.