OS X 10.9 or later. iTunes only allows one playlist to be selected at a time. This applet can perform common useful tasks on a multiple selection of playlists: rename (add text, remove text, search and replace text), duplicate, delete, export, merge.
Tools in the Rename tab operate on the selected playlists' names
(via in-app purchase)
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Write size of track's artwork to chosen tag or copy tracks with artwork of certain size to playlist
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Exports and then re-imports selected tracks' artwork
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Gather audio tracks whose files contain no artwork metadata
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Emulates iTunes search and copies results to a playlist
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Assist with discovering and eliminating same-named tracks
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View/Edit tags of selected track(s) in single window