Deepin Desktop Environment (DDE) is a relatively new DE. It is the featured desktop of the Debian-based Deepin OS.
The most recent iteration is written in QT, and Deepin applications are mostly built using DTK (Deepin Tool Kit), which itself is based on C++ and QT.
You can add or edit Deepin Terminal themes in
To see available shortcuts for any Deepin Application use
Ctrl + Shift + ?