Gnome Extensions

• Add to Desktop by Tommimon
• Alphabetical App Grid *
• AppIndicator and KStatusNotifierItem Support by 3v1n0
• App Name Indicator
• Auto Move Windows
• Blur my Shell by aunetx
• Dash to Dock for COSMIC
• Dash to Dock *
• GNOME Shell Open Terminal
• Hide Activities Button
• Just Perfection
• Lock Keys by kazimieras.vaina *
• No Overview at Startup
• OpenWeather by skrewbal
• Panel Settings
• (QSTweak) Quick Setting Tweaker
• Space Bar * - Replaces the top-panel workspace indicator with an i3-like workspaces bar.
• Start Overlay in Application View by Hex_cz
• Switcher - Ulauncher style application launcher.
• Systemd Manager
• System Monitor Tray Indicator
• Top Bar Organizer
• Tweaks & Extensions in System Menu
• User Themes
• Workspace Indicator by tty2
• Workspaces indicator by open apps by Favo02

Menu Systems

• Apps Menu by fmuellner - Applications Menu
• ArcMenu - Applications Menu
• Axe Menu - Applications Menu
• Custom Menu by al3dv
• Command Menu 2 by goldentree1
• Dexi Applications Menu - Applications Menu
• Fildem global menu
• Frippery Applications Menu - Applications Menu
• Gnome Global Application Menu
• Gno-Menu - Applications Menu
• Kiwi is not Apple
• Kiwi Menu by Arnis K - macOS-inspired quick menu for GNOME
• Logo Menu
• Places Status Indicator
• Poppy Menu - Clone of Apple Menu
• Settings Menu
• System Menu by jonius

Window Tiling

• Awesome Tiles
• Fancy Tiling by DevRoamer
• Forge by forge-ext
• gTile
• Tactile - Tile windows on a custom grid using your keyboard.
• Tiling Shell by domferr
• WinTile
• WinTile-Beyond
• Workspace Indicator by fmuellner

Pop Shell

Fedora

sudo dnf install gnome-shell-extension-pop-shell

For Ubuntu-Based Distros

Read article on System76 website