K4dirstat
K4DirStat (KDE Directory Statistics) is a small utility program that sums up disk usage for directory trees, very much like the Unix 'du' command. It displays the disk space used up by a directory tree, both numerically and graphically (copied from the Debian package description).
Install / Use
/learn @jeromerobert/K4dirstatREADME
Overview

See the wiki.
Building
First install Qt 5 and KDE Framework 5 headers. On Debian and its derivatives it can be done with:
apt-get install extra-cmake-modules qtbase5-dev libkf5coreaddons-dev \
libkf5i18n-dev libkf5xmlgui-dev libkf5doctools-dev libkf5kio-dev
Then run cmake:
cmake -DCMAKE_INSTALL_PREFIX=/path/where/to/install
make install
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