I've been lately curating a pkgsrc repo for Slackware 15.0. It definitely required some dedication (smaller quirks to fix), but eventually allowed me to easily deploy and maintain software which is not available on the official mirror, without having to rely on SlackBuilds and sbopkg (something which I never regarded as an efficient and reliable method). The repo is built on my amd64 workstation and predictably only includes desktop-oriented software I routinely use. Available at: https://retrobsd.ddns.net/pub/packages/All/