This addon has been redesigned and re-released for Dragonflight, you can download it here: TalentTree Viewer | Dragonflight
Usage is simple, click the minimap button, or type /tv or /talentviewer in chat to open the talent frame
Use the dropdown to pick between any class, and any spec, and view their talents
The talent frame looks exactly like the default blizzard talent frame; or skinned with elvui if you have elvui enabled
You cannot change talents, or view what talents you have selected, but you can link talents to chat, or to macros; and of course, you can view the tooltips
This only works in retail!
This addon integrates with BlizzMove to make the Talent UI movable, I strongly recommend using it