This grouping are characters who are neither aligned to the Empire/First Order or the Rebel Alliance. In most cases they (e.g. Boba Fett) will offer their services to the Empire for a fee. Jabba, the Hutt is aligned to neither but is after Han Solo who backed out of a deal at the last moment. Even though they fall into this group, one should not assume them to be evil such as Jabba, for example, Shmi Skywalker, the single parent mother of Anakin Skywalker falls into this group but she is on no ones side.