In case you're not familiar with Rclone, this is a command line tool for synchronizing files from or to cloud storage services, which supports Google Drive, Google Cloud Storage, Dropbox, Microsoft One Drive, Amazon S3, Amazon Drive, Openstack Swift / Rackspace cloud files / Memset Memstore, Hubic, Yandex Disk, and Backblaze B2. 

Rclone can synchronize files either directly between these cloud services, or to / from your local filesystem.

RcloneBrowser allows browsing and modifying (upload / download / remove, etc.) remote repositories, such as Google Drive, Dropbox, oneDrive and so on, including encrypted ones, using the same configuration file as Rclone, so you don't have to configure remote services twice.

The extension provides numerous features, including the ability to move the panel to the top or bottom, change the panel size, live window previews, and more.

MATE Dock Applet is a MATE Panel applet that displays running application windows as icons, which features option to pin applications to the dock, supports multiple workspaces, allows changing the MATE panel icon to the dominant desktop wallpaper color, and more.

Metamorphose 2 is an advanced batch file and folder renamer for Linux and Windows. The application features a wide range of renaming options, allows previewing changes before applying them, allows saving the renaming rules for future use, and much more.

I recently stumbled upon Toggl, a tool that provides online time tracking and reporting, and thought I'd share it with those of you who need such an application and are not yet familiar with it.

Plotinus is a library that adds a searchable command palette to any GTK+ 3 application, similar to the Atom and Sublime Text Command Palette feature (or Unity HUD).

The original KDE Connect Indicator hasn't been updated in about 2 year however, Steeven Lopes forked it, getting it to work with recent Ubuntu versions, while also adding various improvements: