Totally by accident, searching for Valgrind package for one of my (still not yet up to date) Slackwares 12.0 (yes, I'm lazy to compile it), I stumbled on this site by the Italian Slackware Community.

They have a large package repository (everything you won't find on official CDs/DVD), and guess, there is EDE package too. Awesome!

Go slacky.eu, go :)