This plugin shows a list (GUI) of your ships inside your capship (with addons+cargo) and offers easy launch option for each ship.

Screenshot:
https://imgur.com/a/1Wl31
(couldn't upload screenshot here, so I uploaded it to imgur)

(I made this plugin when the ship list had only cargo amount without contents. Now the contents are shown too. I'm a little late publishing this. Anyways here it is, use it if you like)