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Workspace indicator + icons of apps running on each workspace + Extension Manager (installed extensions, quick access to preferences, enabling/disabling, restaring/reloading). Allows scrolling over to switch workspace. Uses default GS, built-in or custom theme.
Yet Another Window List *** taskbar (current/all workspaces, favorite apps, icons reordering saved across reboots, advanced app-specific menus, Quicklists, blinking attention, changing workspace by scrolling over task bar etc.) *** window indicators and thumbnails + "window peeking" (preview window by scrolling over its thumbnail) *** lots of settings + much more.