I have just updated the gimp-gap Slackbuild to include initials of my name (wsr). It's meant as an identifier of the packager. We adopt this from SlackBuilds project which is a very nice project with lots of active people on it.
We (Indonesian Slackware Community) has started to work out on a small repository of SlackBuilds scripts which we hosted on Indonesian Slackware Community Site. It's not as complete as SlackBuilds nor Slacky.eu, but we are working to provide an alternative to Slackware users who had problems compiling application from source or finding a tgz files.
If you are interested to build a package, please have a look on the repository