BubbleUPnP has the option (Now Playing: Show Composer) to display the Composer next to the Artist on the now playing screen, but it doesn't show it in the track listing like Hi-Fi Cast does.
One of the reasons I use MinimServer is its ability to virtually manipulate tags to be passed onto the renderer e.g. If you wanted to see Composer in addition to Artist wherever you'd normally see Artist (like in the track listing), use the configuration option 'Artist.displayFormat={$Artist^$Composer^ (^)^}', which tells MinimServer to send the tag Artist to the control point with the value %artist% (%composer%).
You can get really creative, and it allows you to store tags the way you want to, not the way you have to in order to get the control point to display them a particular way e.g.
Code:
TITLE=Bag Lady
SUBTTILE=Cheeba Sac Radio Edit
TRACKTYPE=Bonus
Using the option: Title.displayFormat={$title^$subtitle^ (^)^$trackType^ [^ Track]^}, displays "Bag Lady (Cheeba Sac Radio Edit) [Bonus Track]" in EVERY control point.