Gui.cs is described as 'Simple UI toolkit for .NET, .NET Core and Mono and works on both Windows and Linux/Unix. The toolkit contains various controls for building text user interfaces from buttons, checkboxes and lists to menus, frames and windows' and is an app in the development category. There are more than 10 alternatives to Gui.cs for a variety of platforms, including Linux, Mac, Windows, Cygwin and Oracle Solaris apps. The best Gui.cs alternative is Ratatui, which is both free and Open Source. Other great apps like Gui.cs are ncurses, FINAL CUT, newt and Turbo Vision.