KDE software is hosted on infrastructure managed by the KDE Sysadmins.
Some projects such as i18n (to localize the programs) or some websites still use SVN. The repository can be browsed on https://websvn.kde.org/. Some guidelines could be found in https://techbase.kde.org/Getting_Started/Sources/Subversion (TO BE MOVED).
Some of the components hosted on this infrastructure include: