A link to a modified instance of slakfinder added on menus at slackel.sourceforge.io/slakfinder containing repositories for slackware 15.0 and slackware current.
This instance created also because on slakfinder the sourceforge slackel repository included and not the default https://slackware.uk/slackel/x86_64/current/ and https://slackware.uk/slackel/i486/current/ so libreoffice and other packages are not exist in list.
Using the default repositories which also exist in slapt-getrc, all packages are listed.