Apps similar to COSMIC Files include Dolphin File Manager, which is free and open source. Other options are GNOME Files, Thunar, Strata File Manager and Caja. In total there are five File Managers like COSMIC Files for Linux, Mac and Windows.
Usability-focused file manager for KDE desktops offering tabbed and dual-pane browsing, archive support, quick file renaming, filter-based searching, customizable icons, theme adaptation, preview modes, and extensibility with various service integrations.
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EU
GNOME Files, formerly known as Nautilus, is the official file manager for the GNOME desktop, giving the user a simple way to navigate and manage its files.
United States
Thunar is a modern file manager for the Xfce Desktop Environment. Thunar has been designed from the ground up to be fast and easy-to-use. Its user interface is clean, intuitive, and customizable. Thunar is fast and responsive with a good start up time and directory load time.
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Strata combines spatial Miller-column navigation with familiar Icons and List views, instant fuzzy filename search, rich previews, and native Linux desktop integration. It is designed for Omarchy and works on compatible GTK4 Linux environments.
Canada
Caja is a fork of Nautilus from GNOME 2 and is native to the MATE Desktop Environment. It is a file manager like the Windows Explorer (not to confuse with Internet Explorer/Microsoft Edge), but for Unix/BSD and Linux.
