The following is a list of spaceborne species:

Although the Founders apparently preferred starships for space travel, Laas was capable of turning into a warp-capable, space-dwelling lifeform.
Polycocyx astris was one of over 200 million space-dwelling microbes that had been cataloged by 2151.
The Silver Blood copy of USS Voyager didn't have a problem being exposed to space, at least as a copy of the real Voyager's hull plates.
Although the majority of these spaceborne species are known to be sentient, this animal is known to be a non-sentient lifeform.
Though native to fluidic space, these living vessels were also capable of surviving in normal space with no apparent discomfort.