In Dark Frontier, Voyager
travelled with transwarp - which, according to Prof. Hansen, is similar to quantum slipstream.
All Full Circle ships are equipped with QSD.
To my knowledge, Voyager accessed the alien network only twice before it collapse, to send the Doctor and receive Starfleet's response. However, it can be hacked: In the STO timeline, Sela used in 2403 to contact Hirogen in the Beta Quadrant to ally with them. Btw, by 2409, every single ship and shuttle class can be equipped with QSD, including Federation, Klingon, Terran, Cardassian, Ferengi, Dominion and Breen starships.