Gamma (Γ) is a lightweight text editor. It is intended to be an alternative to Gedit or Notepad++. Although the current implementation is tested on Linux with a GNOME desktop environment, it can also run on Linux, Windows and Mac if the dependencies are installed (see the Dependencies section below).
Gamma uses GTK3 (cross-platform GUI toolkit) and PyGObject which is a Python package that provides links to GObject-based libraries, such as GTK, GStreamer, WebKitGTK, GLib, GIO and more.
If you are using Linux with a GNOME desktop, you probably already have these dependencies installed. I’m not sure if the libraries are installed for other desktops, like KDE, XFCE or MATE. But if you have libgtk-3-0 and python3 installed, then Gamma will probably work.
Gamma is a very intuitive text editor, but if you want more information, I suggest you consult the official documentation on their Gitlab at: https://gitlab.com/hamadmarri/gamma-text-editor