The OWListboxForAqua is not a replacement, it is a Listbox subclass specifically for the Mac that uses Wallpaper Tinted Row backgrounds, Overlay (style) scrollers and Big Sur style insets, making your Xojo Listboxes more modern on a Mac. This subclass requires Mac OS X 10.14 to work correctly, but will fall back to older functionality on 10.13 or below (there appear to be bugs in the macOS view management on 10.13 that I currently cannot work around).
GraffitiListBox is a ContainerControl that has a ListBox and a custom-drawn header component inside. Everything’s been customized to look at home on the target OS including coloring (even in Windows Dark Mode). Headers have menus, nicer sort indicators, all kinds of niceties. It also uses the OS accessibility options for drawing (thanks to a request from @Tim_Parnell ).
I also have GraffitiGrid for Desktop, which supports things that GraffitiListBox doesn’t, such as embedding ContainerControls in cells, and is meant for complex data display. It also has events for data formatting and drawing.