To my knowledge no plugin.
Theme hardcoded will surely work. (But any change does need external (by ftp or editor) theme change
Dependant on the theme you are using, the option to use a menu area (or create a menu area) so you have more possibilities? (like dividing by columns (blocks) etc.. (most versatile solution))
Inside using links which can be altered 'on site . (remember the v1 Core theme? that used links+img to parts of e107 in box form ( 3 in a row)