Desktop Environment Ecosystems

On second thoughts, DEs usually have a large number of apps, so I can't really mention all of them.

1. GNOME
   1. File Manager: Nautilus
2. KDE Plasma
   1. File Manager: Dolphin
3. Xfce
   1. File Manager: Thunar
4. Cinnamon
   1. File Manager: Nemo
5. MATE
   1. File Manager: Caja
6. LXDE
   1. File Manager: PCManFM
7. LXQt
   1. File Manager: PCManFM-Qt
8. Deepin
   1. File Manager: Deepin File Manager
9. Cutefish
10. Pantheon
11. Budgie
12. Pantheon
13. Enlightenment