Plugins and extensions
Who says no to more features?
Dolphin doesn’t provide a centralised list of supported plugins or extensions. The KDE store, however, does provide an easy access to Dolphin’s Service Menus from under the KDE App-Addons heading on the sidebar. Each of these add further options to the context menu, such as the convert jpg to png addon, which is self-explanatory, and uses Imagemagick to convert the images. There are similar extensions to convert media files to different formats, export Libreoffice documents to PDF, and so on.
As with Dolphin, GnomeFiles also doesn’t feature a list of plugins or extension on the project’s website or the wiki. Since the project is still referred to by its original name internally, run the dnf search nautilus command on Fedora for a list of plugins available in the software repositories. You can then install useful extension such as gnome-terminal-nautilus and nautilus-image-converter. There are similar extensions that help you tie Gnome Files with Dropbox, ownCloud and other services.
The SpaceFM wiki lists all available plugins such as the ClamAV plugin which makes it possible for you to scan the selected files/folders with ClamAV. There’s a similar plugin to help you encrypt/decrypt the selected files/ folders with GPG. Creating plugins for SpaceFM is quite easy and the entire process is discussed at length in the official documentation.
You can find a handful of plugins for Thunar on XFCE’s official Git repositories. The archive plugin adds the option to create archives from the context menu. The shares plugin similarly gives users the option to quickly share folders using Samba. The media tags plugin add ID3/OGG support to the bulk rename dialog.