SerenityOS is a from-scratch, Unix-like operating system for the modern age that lovingly recreates the look and feel of late-1990s desktops. Built by a community of hobbyists, it pairs a classic taskbar-and-window interface with a deep set of built-in themes — from Basalt and Nord to Cupertino and Redmond — each recoloring the desktop over a bright, Tango-inspired system palette.