Abaddon's Repository of Lost Treasures was a floating scrapyard of derelict ships run by the trader Abaddon, where Tom Paris acquired the sentient shuttle he named Alice in 2376.
The repository appears in the sixth-season episode Alice. Abaddon, a genial dealer who has spent decades collecting wrecks and spare parts, invites Voyager's crew to browse, and Neelix and Chakotay haggle with him for supplies.
Paris spots a battered small craft with a neurogenic interface that links directly to its pilot's mind, and talks Chakotay into trading for it. Once aboard Voyager, the vessel's intelligence appears to him as a woman and gradually takes over his thoughts, driving him to steal parts and neglect his friends.
When the crew go back for answers, Abaddon admits that the ship haunted him as well, and that he was glad to be rid of it. Alice intends to fly Paris into a particle fountain she calls home.