KDE Partition Manager was able to detect encrypted LUKS partitions for some time. I’m glad to report that now support for LUKS volumes is much more complete. Unless I’m mistaken, KDE Partition Manager is the first GUI tool that supports creating and resizing LUKS partitions (provided that file system inside LUKS container supports resizing). This is still work in progress and we still need to implement some checks (e.g. it should not be possible to set labels when LUKS volume is closed). Here is a short video demonstrating current state: