STFL is a language for easily describing GUIs. STFL is also the name of this library which translates those descriptions into a curses-based widget set for text terminals.

STFL descriptions do not contain any concrete layouting information, such as x/y coordinates of widgets. Instead, container widgets such as vertical and horizontal boxes, as well as tables, are used to group widgets. The actual layouting work is done by the STFL library. This allows STFL GUIs to handle terminals of different sizes and terminal resize events transparently for the application programmer.