Omnitool

Holly finds her old omnitool among Mulch's things when he arrives to save her and Artemis from the Bentley's trunk. This tool can unlock almost any lock.

Holly's Suit

Holly wears a special suit that is designed with multiple features, including an ability to flex around her to protect her from impact.

Holly's Helmut

Holly's helmet contains something similar to a computer interface that allows her to speak to Foaly and to use certain equipment such as scans so that she can find threats or victims. Opal is wearing this helmet at the end of the novel when she goes after Artemis and the lemur.

Cessna

Artemis has a small Cessna that has been working to make completely solar-powered. Artemis escapes from his home in this plane in an attempt to draw Opal away from his mother and his friends at the end of the book.

Shuttles